Universe Today

January 8, 2014December 23, 2015 by Jason Major

Dark Sky Regulations Bring Zodiacal Light to Rhode Island Observatory

Zodiacal light over Charleston, RI (Scott MacNeill, Frosty Drew Observatory)

The result of sunlight reflected off fine particles of dust aligned along the plane of the Solar System, zodiacal light appears as a diffuse, hazy band of light stretching upwards from the horizon after sunset or before sunrise. Most people have never seen zodiacal light because it’s very dim, and thus an extremely dark sky is required. But thanks to recent dark sky regulations that were passed in the coastal Rhode Island town of Charlestown, this elusive astronomical phenomenon has become visible — to the particular delight of one local observatory.

Frosty Drew Observatory is a small, privately-run observatory featuring a Meade Schmidt Cassegrain LX200 16″ telescope mounted on an alt-azimuth pier inside a dome that stands among the sports fields, parking areas, and nature trails of Ninigret Park and Wildlife Refuge in southern Rhode Island. Being a good distance from urban centers and developed areas, the skies there are some of the darkest in the state. But situated along the eastern seaboard of the United States, even Charlestown’s coast lies beneath a perpetual haze of light pollution.

A new town ordinance, passed in 2012, helped to darken the skies a notch. And while watching comet ISON one evening, astronomer Scott MacNeill became aware of the results.

The following is an excerpt from a Jan. 7 article by Cynthia Drummond of The Westerly Sun, reprinted with permission:

Scott MacNeill was in Ninigret Park, his telescope trained on the comet “Ison,” when he saw something he had never seen before: a celestial phenomenon called “zodiacal light.” After several decades of being obscured by light pollution, the feature was visible again, thanks to the town’s “dark sky” ordinance.

At first, MacNeill, an astronomer and the assistant director of the Frosty Drew observatory, didn’t believe what he was seeing. The cone of light, which he initially thought was light pollution, turned out to be a faint, white glow that astronomers at the observatory hadn’t glimpsed in recent memory.

A line of visitors is cast in silhouette against the evening sky as they wait to go into the Frosty Drew Observatory. (Susannah Snowden / The Westerly Sun)

“To see it in New England, period, is amazing, Zodiacal light is a common marker for the quality of a dark sky location.”

– Scott MacNeill, Astronomer, Frosty Drew Observatory

“I was sitting back for a minute, just looking at the sky, and I said ‘wait a minute. This is the southeast, and to the southeast is the ocean. What is coming up in the southeast?’ And then I noticed the cone. And I’m like ‘no way. That can’t be zodiacal light.’ I’ve heard so many stories about the days of old at Frosty Drew when you used to see zodiacal light here,” he said.

MacNeill credits Charlestown’s dark sky ordinance with reducing light pollution to the point where zodiacal light can be seen again. The ordinance, adopted in October 2012, regulates commercial outdoor lighting in order to improve the town’s dark sky for star-gazers, and to protect residents, wildlife and light-sensitive plants from the effects of light pollution.

One of the provisions of the ordinance requires that new lighting fixtures be designed to focus downward so light does not radiate up into the sky. Lighting installed before the ordinance was passed is exempt from the new regulations.

Building and Zoning Official Joe Warner explained that after the ordinance passed, two major sources of light pollution near the observatory were modified so they would be less polluting.

“At Ninigret Wildlife Refuge, some of the pole lights were changed to dark sky compliant lighting. The Charlestown Ambulance barn also replaced their lights with dark sky compliant lights,” he said.

Charlestown has been recognized as one of the only dark spots on the New England coast — a rare treat for people who enjoy looking at the night sky.

(Read the full article on The Westerly Sun’s website here.)

_________________

It’s fantastic to see results like this both occurring and being publicized, as dark skies have become quite rare in many populated areas of the world. People who live in or near major metropolitan areas — even in the surrounding sprawling suburbs — often never truly get a dark sky, not such that the dimmer stars, the Milky Way, meteor showers — and yes, the zodiacal light — can be readily seen on an otherwise clear night. The view of a star-filled night sky that has been a part of the human existence for millennia has steadily been doused by the murky glow of artificial lighting. Luckily groups like the International Dark Sky Association are actively trying to change that, but change isn’t always welcome — or quick.

At least, in one Rhode Island town anyway, a small victory has been won for the night.

(HT to Brown University’s Ladd Observatory in Providence for the heads-up on this story.)

January 8, 2014December 23, 2015 by Nancy Atkinson

NASA: International Space Station Operations Extended to 2024

Astronaut Rick Mastraccio works outside the International Space Station during a spacewalk on Dec. 24, 2013. Credit: NASA

NASA announced today that the Obama administration has approved NASA’s request for an extension of operations for the International Space Station for an additional four years to 2024. This means work on board the orbiting laboratory will continue at least for another decade.

“I think this is a tremendous announcement for us here in the space station world,” said Bill Gerstenmaier, associate administrator for NASA’s Human Exploration and Operations Mission Directorate, speaking during a press briefing today, “ and also for all of human spaceflight and for our international partnership.”

“This is a tremendous gift the administration has given us,” he added later.

Gerstenmaier said the extension allows NASA to expand their planning horizons, and it will change the way scientists and commercial companies look at their “investment” in the future of the ISS.

“We’re starting to see a lot of science benefits on ISS that have a lot of applications here on Earth, such as pharmaceuticals, materials processing, and climate change equipment, and operating until least 2024 opens up a large avenue of research on the ISS,” he said. “This also changes the perspective for commercial providers … as the commercial sector now has a larger market to carry cargo to space for NASA, as well as crew.”

Commercial Spaceflight Federation president and former astronaut Michael Lopez-Alegria agreed. “The International Space Station is the crown jewel of NASA’s human spaceflight program,” he said in a statement. “This extension comes at a critical time and paves the way for the ISS to fulfill its extensive and multifaceted potential – as a research lab that will provide countless benefits here on Earth, as an anchor destination for America’s commercial space race and as a jumping off point for deep space technology development and exploration.”

Gerstenmaier also sees the ISS as a proving ground for future human spaceflight plans to head out to deep space. “NASA doesn’t think of ISS and deep space human plans as separate, but as a combined strategy,” he said.

A recent review of ISS modules and equipment ensured that the station could likely last until 2028, and Gerstenmaier said this new extension allows operations to be at least considered until nearly 2030.

“Ten years from today is a far-reaching vision,” he said. “Our international partners are well aware of this extension and they were involved in hardware studies to see if station operations could extend. They will continue to evaluate their hardware and they all see this as a positive step in moving forward. … This is truly an international endeavor and we all work together.”

The International Space Station as seen from the crew of STS-119. (Credit: NASA).

Gerstenmeier added that it’s not immediately clear whether all of the 15 nations involved in the ISS along with the US will continue to participate for the duration of the life of the ISS, but that NASA is prepared to work with whatever plans the international partnership evolves into over time.

He said that no additional funding for the ISS was currently required for the extension, as the basic budget now covers the ISS to at least 2020, and the funds set aside for eventually deorbiting the ISS will be shifted towards operations.

Additional funding will likely be required at some point, however, but well past when the current Administration and Congress will be obligated to decide.

January 8, 2014December 23, 2015 by David Dickinson

Gravitational Lens Seen for the First Time in Gamma Rays

An exciting new discovery was unveiled early this week at the 223rd meeting of the American Astronomical Society being held in Washington D.C., when astronomers announced that a gravitational lens was detected for the first time at gamma-ray wavelengths.

The study was conducted using NASA’s Fermi Gamma Ray Space Telescope, and promises to open a new window on the universe, giving astrophysicists another tool to study the emission regions that exist near supermassive black holes.

But the hunt wasn’t easy. A gravitational lens occurs when a massive foreground object, such as a galaxy, bends the light from a distant background object. In the case of this study, researchers targeted a blazar known as B0218+357, a energetic source located 4.35 billion light years away in the direction of the constellation Triangulum.

Blazar and quasar sources are named using their respective coordinates in the sky. Think of “0218+357” as translating into “Right Ascension 2 Hours 18 Minutes, Declination +35.7 degrees north” in backyard astronomer-speak. A blazar is a compact form of quasar that results from a supermassive black hole at the heart of an active galaxy. The term blazar was first coined by Edward Spiegel in 1978. The first quasar discovered was 3C 273 in 1970, which was also later found to be a blazar. 3C 273 is visible in Virgo using a large backyard telescope.

A foreground spiral galaxy seen face on lies along our line of sight between our vantage point and B0218+357. At 4 billion light years distant, the two have the smallest angular separation of any gravitationally lensed system so far identified at less than a third of an arc second across.

“We began thinking about the possibility of making this observation a couple of years after Fermi launch, and all of the pieces finally came together in late 2012,” said Naval Research Laboratory astrophysicist and lead scientist on the study Teddy Cheung in a recent NASA Goddard Spaceflight Center press release.

Observations of the blazar suggested that it would be flaring in September 2012, making it a prime target for the study. In fact, B0218+357 was the brightest extra-galactic gamma-ray source at the time. Cheung was granted time spanning late September into October 2012 to use Fermi’s Large Area Telescope (LAT) instrument to study the blazar in outburst.

Fermi‘s LAT instrument doesn’t have the resolution possessed by radio and optical instruments to catch the blazar in single images. Instead, the team exploited a phenomenon known as the “delayed playback effect” to catch the blazar in action.

“One light path is slightly longer than the other, so when we detect flares in one image we try and catch them days later when they replay in the other image,” Said team member Jeff Scargle, astrophysicist based at NASA’s Ames Research Center.

Cheung presented the findings of the study Monday at the American Astronomical Society meeting, which included three distinct flaring episodes from the background blazar that demonstrated the tell-tale delayed playback events with a period spanning 11.46 days.

A Hubble Space Telescope image of the gravitational lensing of B0218+357. Credit: NASA/ESA and the Hubble Legacy Archive.

Follow-up observations in radio and optical wavelengths supported the key observations, and demonstrate that Fermi’s LAT imager did indeed witness the event. Interestingly, the delay for the gamma-rays from the lensed blazar takes about a day longer than radio waves to reach the Earth. B0218+357 is also about four times brighter in gamma-rays than in radio wavelengths.

This occurs because the gamma-rays are emanating from a slightly different region than radio waves generated by the blazar, and are taking a different path though the gravitational field of the foreground galaxy. This demonstrates that assets like Fermi can be used to probe the heart of the distant energetic galactic nuclei which harbor supermassive black holes. This opens the hot topic of gravitationally lensed blazars and their role in extra-galactic astronomy up to the gamma-ray spectrum, and gives cosmologists another gadget for their tool box.

“Over the course of a day, one of these flares can brighten the blazar by 10 times in gamma-rays but only 10 percent in visible light and radio, which tells us that the region emitting gamma-rays is very small compared to those emitting at lower energies,” Said Stockholm University team member Stefan Larsson in the recent press release.

Using the analysis of lensing systems at gamma-ray wavelengths will not only help to probe these enigmatic cosmological beasts, but it may also assist with refining the all-important Hubble Constant, which measures the rate at which the universe is expanding.

But Fermi may just beginning to show its stuff when it comes to hunting for extra-galactic sources. The really exciting breakthrough, researchers say, would be the discovery of an energetic extra-galactic source being lensed by a foreground galaxy in gamma-rays that hasn’t been seen been seen at other wavelengths. This recent finding has certainly demonstrated how Fermi can “see” these tell-tale flashes via a clever method. Expect more news in the coming years!

Read the entire paper on the arViv server titled Fermi-LAT Detection of Gravitational Lens Delayed Gamma-ray Flares from Blazar B0218+357.

January 8, 2014December 30, 2015 by Jason Major

Is NASA Dead? Not Even Close.

If you’re a frequent reader of Universe Today you know that, despite the end of the Shuttle program and the constant battle for a piece of the federal budget, NASA has a lot on their plate for future space exploration missions. But there are still a lot of people among the general public who think that the U.S. space administration is “dead,” or, at the very least, in the process of dying. Which is unfortunate because there’s actually a lot going on, both in space and in development on the ground.

The video above, released Monday by Johnson Space Center, shows highlights from 2013 as well as some of the many things NASA has in progress. As anyone can see, rumors of its death have been greatly exaggerated! (By whom I’m still not quite sure.)

Visit the Johnson Space Center site for more information and updates on current and future missions.

(Tip of the visor to astronaut Clayton Anderson for the video!)

January 8, 2014December 23, 2015 by Nancy Atkinson

Space Telescopes Look Back 13.2 Billion Years and See Surprisingly Luminous Galaxies

NASA's Hubble Space Telescope and Spitzer Space Telescope joined forces to discover and characterize four unusually bright galaxies as they appeared more than 13 billion years ago, just 500 million years after the big bang. Credit: NASA, ESA, G. Illingworth (University of California, Santa Cruz), P. Oesch (University of California, Santa Cruz; Yale University), R. Bouwens and I. Labbé (Leiden University), and the Science Team.

What was the Universe like more than 13 billion years ago, just 500 million years after the big bang? New data from the Hubble and Spitzer space telescopes reveal some surprisingly bright galaxies that are about 10 to 20 times more luminous than anything seen previously in that epoch.

Garth Illingworth from the University of California, Santa Cruz said the discovery of these four bright galaxies came from combining the power of both telescopes, but these galaxies lie right at the limit of the telescopes’ capabilities.

“We’re actually reaching back 13.2 billion years through the life of the Universe — that’s 96% of the life of the Universe that we are looking back at these galaxies,” said Illingworth, speaking at the American Astronomical Society meeting in Washington D.C. this week. “That’s an astonishing undertaking and an astonishing accomplishment that Hubble and Spitzer have achieved.”

Detail of the Hubble and Spitzer observations of a galaxy from the early Universe. Credit: NASA, ESA, G. Illingworth (University of California, Santa Cruz), P. Oesch (University of California, Santa Cruz; Yale University), R. Bouwens and I. Labbé (Leiden University), and the Science Team.

Illingworth said the typical galaxy candidate from that far back in time is very faint and hard to see. But these new galaxies are about 15-20 % brighter than what astronomers have seen before at redshift 10.

The tiny are bright because they are bursting with star formation activity. The brightest one is forming stars approximately 50 times faster than the Milky Way does today. Although these fledgling galaxies are only one-twentieth the size of the Milky Way, they probably contain around a billion stars crammed together.

Astronomers think these bright, young galaxies grew exceptionally fast because of interactions and mergers of smaller infant galaxies that started forming stars even earlier in the Universe. Since the ancient time billions of years ago when the light that we now see started its long journey to us, they have probably kept growing to become similar to the largest modern galaxies. Many of the stars of these infant galaxies likely live on today in the centers of giant elliptical galaxies, much larger even than our own Milky Way.

Slide from Garth Illingworth's presentation at the 223rd American Astronomical Society meeting, describing the discovery of bright galaxies from early in the Universe. Credit: Garth Illingworth. — Slide from Garth Illingworth’s presentation at the 223rd American Astronomical Society meeting, describing the discovery of bright galaxies from early in the Universe. Credit: Garth Illingworth.

Illingworth said this era appears to be a timeframe where things were changing quite rapidly. “We’ve gone back to a very interesting time when the Universe is changing,” he said.

The galaxies were first detected with Hubble, and astronomers were able to measure their star-formation rates and sizes. But using Spitzer, the scientists were also able to measure the galaxies’ masses.

“This is the first-ever measurement of the mass density of the galaxies when the Universe was at 500 million years of age,” Illingworth said. “These galaxies are about a billion times the mass of our Sun, which is massive for those times, but still only 1% the mass of the Milky Way.”

Illingworth added that the mass measurements are rough estimates because of how challenging the task was.

Illingworth and team member Ivo Labbé from Leiden University said they are looking forward to finding out more about these galaxies, particularly from future observations with the upcoming James Webb Space Telescope.

“At the same time, the extreme masses and star formation rates are really mysterious,” Labbé said, “and we are eager to confirm them with future observations on our powerful telescopes.”

You can find out more about these early galaxies — and more — at the First Galaxies website.

Private Antares/Cygnus rocket Glistens and Go for Launch as Polar Vortex Sweeps in Brutal Bone Chilling Cold

Antares commercial rocket built by Orbital Sciences Corp. glistens at dusk on Jan. 7 amidst bone chilling cold ahead of blastoff scheduled for Jan. 8, 2014 from NASA Wallops Island, Virginia. Credit: Ken Kremer - kenkremer.com

UPDATE: Orbital announced the Antares launch today (Jan. 8) has been scrubbed because of solar activity. More info on the issue and a new launch date will be forthcoming.

Update: NASA and Orbital have set Thursday, Jan. 9 as the new Antares launch date. Liftoff is targeted for 1:07 p.m. (EST) Watch the launch live, below.

WALLOPS ISLAND, VA – Launch managers gave the “GO” for launch of the private Antares/Cygnus rocket to the space station on Wednesday, Jan. 8, even as the polar vortex swept in bone chilling cold to the launch site on the Virginia shore and across much of the United States.

At a launch readiness review today (Jan. 7), managers for spacecraft builder Orbital Sciences approved the launch, pending completion of a few remaining items, said Mike Pinkston, Antares program director for Orbital, at a media briefing today.

The commercial Antares rocket is launching the Cygnus cargo spacecraft on its first operational mission bound for the International Space Station (ISS) with a huge bounty of science experiments.

Live streaming video by Ustream

Antares commercial rocket spacecraft awaits Jan. 8 blastoff at Launch Pad 0A at NASA Wallops Flight Facility, VA. Credit: Ken Kremer - kenkremer.com — Antares commercial rocket awaits Jan. 8 blastoff at Launch Pad 0A at NASA Wallops Flight Facility, VA. Credit: Ken Kremer – kenkremer.com

Blastoff is slated for 1:32 p.m. EST from Launch Pad 0A at the Mid-Atlantic Regional Spaceport (MARS) at NASA Wallops, Virginia.

There is only a 5 minute launch window that extends to 1:37 p.m.

The launch of the two stage, 133 foot tall Antares could put on a spectacular sky show.

Antares blastoff may be visible to millions of spectators up and down the US East Coast spanning from South Carolina to Massachusetts – weather permitting.

Read my complete launch viewing guide – here.

The Antares launch comes amidst the unprecedented, unrelenting and dangerous cold arctic air mass sweeping across the US.

Frigid, high winds buffeted the rocket and launch site all day today as technicians continued last minute preparations, taking care to insure safety for the rocket and themselves.

But tonight Antares and Cygnus were glistening beautifully under star lit skies during my up close visit to the launch pad.

Antares commercial rocket awaits Jan. 8 blastoff to the ISS from on ramp at Launch Pad 0A at NASA Wallops Flight Facility, VA. Credit: Ken Kremer - kenkremer.com — Antares commercial rocket awaits Jan. 8 blastoff to the ISS from on ramp at Launch Pad 0A at NASA Wallops Flight Facility, VA. Credit: Ken Kremer – kenkremer.com

The launch was originally scheduled for Tuesday, but was postponed a day to Wednesday because the rocket is only certified to lift off when the temperature is above 20 degrees Fahrenheit, said Frank Culberton, executive vice president and general manager of Orbital’s advanced spaceflight programs group.

Today’s temperatures at Wallops were only in the single digits and teens and felt much lower with the blustery conditions all day long.

Temperatures are expected to ‘skyrocket’ to the balmy 30’s on Wednesday.

Antares commercial rocket awaits Jan. 8 blastoff at Launch Pad 0A at NASA Wallops Flight Facility, VA. Credit: Ken Kremer - kenkremer.com — Antares commercial rocket awaits Jan. 8 blastoff at Launch Pad 0A at NASA Wallops Flight Facility, VA. Credit: Ken Kremer – kenkremer.com

There is a 95 percent chance of favorable weather at the time of launch, NASA said. High, thick clouds are the primary concern for a weather violation, but they are minor.

Both the Antares and Cygnus are private vehicles built by Orbital Sciences under a $1.9 Billion supply contract with NASA to deliver 20,000 kilograms of research experiments, crew provisions, spare parts and hardware to the ISS.

The flight is designated the Orbital-1, or Orb-1 mission.

Orbital Sciences commercial competitor, SpaceX, is likewise under contract with NASA to deliver 20,000 kg of supplies to the ISS with the SpaceX Falcon 9/Dragon architecture.

Both the Orbital Sciences Antares/Cygnus and SpaceX Falcon 9/Dragon vehicles were developed from the start with seed money from NASA in a public-private partnership.

A total of eight Antares/Cygnus missions to the space station are scheduled over the next two to three years by Orbital under its Commercial Resupply Services (CRS) contract with NASA.

This launch follows a pair of successful launches in 2013, including the initial test launch in April and the 1st demonstration launch to the ISS in September.

Cygnus is loaded with approximately 2,780 pounds / 1,261 kilograms of cargo for the ISS crew for NASA including science experiments, computer supplies, spacewalk tools, food, water, clothing and experimental hardware.

Among the research items packed aboard the Antares/Cygnus flight are an experiment to study the effectiveness of antibiotics in space and a batch of 23 student experiments involving life sciences topics ranging from amoeba reproduction to calcium in the bones to salamanders.

Cygnus cargo vessel up close view at Launch Pad 0A at NASA Wallops Flight Facility, VA. Credit: Ken Kremer - kenkremer.com — Cygnus cargo vessel up close view at Launch Pad 0A at NASA Wallops Flight Facility, VA. Credit: Ken Kremer – kenkremer.com

There is also an ant farm aboard with ant colonies from Colorado, North Carolina and of course host state Virginia too. The goal is to study ant behavior in space in zero gravity and compare that to ants on Earth living under normal gravity.

So you can watch the launch either with your own eyes, if possible, or via the NASA TV webcast.

NASA Television coverage of the Antares launch will begin at 1 p.m. on Jan. 8 – www.nasa.gov/ntv

A launch on either Jan. 8 or Jan. 9 will result in a grapple of Cygnus by the Expedition 38 crew aboard the station on Sunday, Jan. 12 at 6:02 a.m. EDT.

Watch for my ongoing Antares launch reports from on site at NASA Wallops.

Stay tuned here for Ken’s continuing Orbital Sciences, SpaceX, commercial space, Chang’e-3, LADEE, Mars and more news.

Ken Kremer

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Learn more about Orbital Sciences Antares Jan. 8 launch, SpaceX, Curiosity, Orion, MAVEN, MOM, Mars rovers and more at Ken’s upcoming presentations

Jan 7-9: “Antares/Cygnus ISS Rocket Launch from Virginia on Jan. 8” & “Space mission updates”; Rodeway Inn, Chincoteague, VA, evening

Just a GORGEOUS view of Antares at Wallops pad 0A this evening. Space journalists Ken Kremer /Universe Today (right) and Mike Killian (left) setting remote cameras at Antares launch pad amidst bone chilling cold. Credit: Alan Walters/awaltersphoto.com

January 7, 2014December 23, 2015 by Nancy Atkinson

Monster Sunspot Erupts with an X-Class Flare

Image of the X1.2 class solar flare from the Sun on January 7, 2014, as seen from the Solar Dynamics Observatory.

Solar astronomers have been keeping an eye on giant sunspot AR1944, and as it turned towards Earth today, the sunspot erupted with a powerful X1.2-class flare. NOAA’s Space Weather Prediction Center said the flare sparked a “strong radio blackout” today, and they have issued a 24 hour “moderate” magnetic storm watch indicating a coronal mass ejection (CME) associated with the flare may be heading towards Earth. A CME is a fast moving cloud of charged particles which can interact with Earth’s atmosphere to cause aurora, so observers in northern and southern latitudes should be on the lookout for aurora, possibly through January 10.

Here’s a video of the flare from the Solar Dynamics Observatory:

The SWPC forecasters said they are anticipating G2 (Moderate) Geomagnetic Storm conditions to occur on January 9, followed by G1 (Minor) levels January 10. NOAA estimates the CME headed towards Earth might produce a Kp number of 6.

The Earth-directed CME launched from AR1944 at 1832 UTC (1:32 p.m. EST) on January 7. Here’s an animation of the CME. Astronomers have said that this sunspot region remains “well-placed and energetic” so there could be subsequent activity.

A closeup look at sunspot AR1944 on January 6, 2013, comparing its size to Earth. Credit and copyright: Ron Cottrell.

According to SpaceWeather.com, AR1944 has “an unstable ‘beta-gamma-delta’ magnetic field,” making it ripe for activity. Here’s a quick video of today’s X-class flare showing the coronal wave:

AR144 as seen on January 7, 2014. At the bottom are size comparisons to Earth and Jupiter. Credit and copyright: Giuseppe Petricca.

The Solar Dynamics Observatory has a “self-updating” webpage showing the latest views of the Sun in various wavelengths.

January 7, 2014December 23, 2015 by Nancy Atkinson

The Most Common Exoplanets Might be “Mini-Neptunes”

Chart of Kepler planet candidates as of January 2014. Image Credit: NASA Ames

If the dataset from the Kepler mission is any indication, the most common type of exoplanets in our galaxy aren’t Earth-sized rocky worlds or hot Jupiters. In fact, the most common type of exoplanet isn’t one that we see in our own neighborhood at all.

“Perhaps the most remarkable discovery by Kepler is the amount of planets between the size of Earth to four times the size of Earth,” said Geoff Marcy, professor of astronomy at University of California, speaking at the American Astronomical Society meeting this week in Washington D.C. “This is a size range that dominates the planet inventory from Kepler and it a size range not represented in our own Solar System. We don’t know for sure what these planets are made of and we don’t know how they form.”

These “mini-Neptunes” as Marcy called them, represent a huge sample in the Kepler data; about 75% of the planets found by Kepler vary in size between the Earth and Neptune, and for four years since the Kepler data have been rolling in, scientists have been trying to understand these planets.

“There’s been an enormous amount of measurements and quantitative work by the NASA Ames Kepler team,” Marcy said.

While masses and planet densities emerged from the work, astronomers still aren’t certain how they form or if they are made of rock, water or gas.

Mini Neptunian planets range in size from about 1.5 to 4 times the size of Earth and have a rocky core and puffy gaseous shell of varying thickness. Credit: Geoff Marcy — Mini Neptunian planets range in size from about 1.5 to 4 times the size of Earth and have a rocky core and puffy gaseous shell of varying thickness.
Credit: Geoff Marcy

The team focused on about 42 of these planets. Two planets highlighted by Marcy in his presentation are thought to be rocky, and are named Kepler-99b and Kepler-406b. Both are forty percent larger in size than Earth and have a density similar to lead. The planets orbit their host stars in less than five and three days respectively, making these worlds too hot for life as we know it.

The team used Doppler measurements of the planets’ host stars to measure the reflex wobble of the host star, caused by the gravitational tug on the star exerted by the orbiting planet. The measured wobble reveals the mass of the planet: the higher the mass of the planet, the greater the gravitational tug on the star and hence the greater the wobble.

They also the measured transit timing variations (TTV) to determine how much neighboring planets can tug on one another causing one planet to accelerate and another planet to decelerate along its orbit.

These measurements allow for computing mass and densities of the planets, as well as figuring out the possible chemical composition of these worlds. The majority of the measurements suggest that the mini-Neptunes have a rocky core but some may have a gaseous outer shell of hydrogen or helium. Some might just be rocky with no outer envelope at all.

“What we think is happening is that some of these planets may have water on top of a rocky core,” Marcy said. “Larger planets might have the same rocky core with added gas. That’s how you get planets measuring from 1 to 4 earth radii. The planets with lower densities imply increasing amounts of gas on top of a rocky core.”

Illustration of the Kepler spacecraft (NASA/Kepler mission/Wendy Stenzel)

“Kepler’s primary objective is to determine the prevalence of planets of varying sizes and orbits. Of particular interest to the search for life is the prevalence of Earth-sized planets in the habitable zone,” said Natalie Batalha, Kepler mission scientist at NASA’s Ames Research Center. “But the question in the back of our minds is: are all planets the size of Earth rocky? Might some be scaled-down versions of icy Neptunes or steamy water worlds? What fraction are recognizable as kin of our rocky, terrestrial globe?”

The team said that the mass measurements produced by Doppler and TTV will help to answer these questions. The results hint that a large fraction of planets smaller than 1.5 times the radius of Earth may be comprised of the silicates, iron, nickel and magnesium that are found in the terrestrial planets here in the Solar System.

Armed with this type of information, scientists will be able to turn the fraction of stars harboring Earth-sizes planets into the fraction of stars harboring bona-fide rocky planets. And that’s a step closer to finding a habitable environment beyond the Solar System.

Marcy added later in the discussion that there’s one type of telescope that would most helpful: a Terrestrial Planet Finder type mission that would measure the temperature, size, and the orbital parameters of planets as small as our Earth in the habitable zones of distant solar systems. Alas, TPF was canceled.

Read more about the study of mini-Neptunes here.

January 7, 2014December 23, 2015 by Jason Major

Super-sensitive Camera Captures a Direct Image of an Exoplanet

The Gemini Planet Imager’s first light image of Beta Pictoris b (Processing by Christian Marois, NRC Canada)

The world’s newest and most powerful exoplanet imaging instrument, the recently-installed Gemini Planet Imager (GPI) on the 8-meter Gemini South telescope, has captured its first-light infrared image of an exoplanet: Beta Pictoris b, which orbits the star Beta Pictoris, the second-brightest star in the southern constellation Pictor. The planet is pretty obvious in the image above as a bright clump of pixels just to the lower right of the star in the middle (which is physically covered by a small opaque disk to block glare.) But that cluster of pixels is really a distant planet 63 light-years away and several times more massive — as well as 60% larger — than Jupiter!

And this is only the beginning.

GPI installed on the Gemini South 8m telescope. GPI is the boxed suite mounted under the platform. (Gemini Observatory) — GPI installed on the Gemini South 8m telescope. GPI is the boxed suite mounted beneath the platform. (Gemini Observatory)

While many exoplanets have been discovered and confirmed over the past couple of decades using various techniques, very few have actually been directly imaged. It’s extremely difficult to resolve the faint glow of a planet’s reflected light from within the brilliant glare of its star — but GPI was designed to do just that.

“Most planets that we know about to date are only known because of indirect methods that tell us a planet is there, a bit about its orbit and mass, but not much else,” said Bruce Macintosh of the Lawrence Livermore National Laboratory, who led the team that built the instrument. “With GPI we directly image planets around stars – it’s a bit like being able to dissect the system and really dive into the planet’s atmospheric makeup and characteristics.”

And GPI doesn’t just image distant Jupiter-sized exoplanets; it images them quickly.

“Even these early first-light images are almost a factor of ten better than the previous generation of instruments,” said Macintosh. ” In one minute, we were seeing planets that used to take us an hour to detect.”

Despite its large size, Beta Pictoris b is a very young planet — estimated to be less than 10 million years old (the star itself is only about 12 million.) Its presence is a testament to the ability of large planets to form rapidly and soon around newly-formed stars.

“Seeing a planet close to a star after just one minute, was a thrill, and we saw this on only the first week after the instrument was put on the telescope!” added Fredrik Rantakyro a Gemini staff scientist working on the instrument. “Imagine what it will be able to do once we tweak and completely tune its performance.”

Another of GPI’s first-light images captured light scattered by a ring of dust that surrounds the young star HR4796A , about 237 light-years away:

GPI first-light images of HR4796A. (Processing by Marshall Perrin, Space Telescope Science Institute.)

The left image shows shows normal light, including both the dust ring and the residual light from the central star scattered by turbulence in Earth’s atmosphere. The right image shows only polarized light. Leftover starlight is unpolarized and hence removed. The light from the back edge of the disk (to the right of the star) is strongly polarized as it reflects towards Earth, and thus it appears brighter than the forward-facing edge.

It’s thought that the reflective ring could be from a belt of asteroids or comets orbiting HR4796A, and possibly shaped (or “shepherded,” like the rings of Saturn) by as-yet unseen planets. GPI’s advanced capabilities allowed for the full circumference of the ring to be imaged.

The GPI integration team celebrates after obtaining first light images (Gemini Observatory) — The GPI integration team celebrating after obtaining first light images (Gemini Observatory)

GPI’s success in imaging previously-known systems like Beta Pictoris and HR4796A can only indicate many more exciting exoplanet discoveries to come.

“The entire exoplanet community is excited for GPI to usher in a whole new era of planet finding,” says physicist and exoplanet expert Sara Seager of the Massachusetts Institute of Technology. “Each exoplanet detection technique has its heyday. First it was the radial velocity technique (ground-based planet searches that started the whole field). Second it was the transit technique (namely Kepler). Now, it is the ‘direct imaging’ planet-finding technique’s turn to make waves.”

This year the GPI team will begin a large-scale survey, looking at 600 young stars to see what giant planets may be orbiting them.

“Some day, there will be an instrument that will look a lot like GPI, on a telescope in space. And the images and spectra that will come out of that instrument will show a little blue dot that is another Earth.”

– Bruce Macintosh, GPI team leader

The observations above were conducted last November during an “extremely trouble-free debut.” The Gemini South telescope is located near the summit of Cerro Pachon in central Chile, at an altitude of 2,722 meters.

Source: Gemini Observatory press release

January 6, 2014December 23, 2015 by Ken Kremer

How to See Spectacular Antares Commercial Rocket Launch to Space Station on Jan. 8 – Complete Viewing Guide

Orbital 1 Launch from NASA Wallops Island, VA on Jan. 8, 2014- Time of First Sighting Map
This map shows the rough time at which you can first expect to see Antares after it is launched on Jan. 8, 2014. It represents the time at which the rocket will reach 5 degrees above the horizon and varies depending on your location . We have selected 5 degrees as it is unlikely that you’ll be able to view the rocket when it is below 5 degrees due to buildings, vegetation, and other terrain features. As an example, using this map when observing from Washington, DC shows that Antares will reach 5 degrees above the horizon approximately 100 seconds after launch (L + 100 sec). Credit: Orbital Sciences/NASA [/caption]

WALLOPS ISLAND, VA – Catching a slim weather break amidst the monster blizzard and unprecedented arctic air low temperatures afflicting the central and northern United States, Orbital Sciences Corp. is marching forward with plans for a spectacular daylight blastoff of the firms privately developed Antares rocket and Cygnus cargo spacecraft on Wednesday, Jan. 8 from a beachside pad at NASA Wallops Island, VA – on a critical mission for NASA bound for the Space Station carrying a huge cargo of vital science experiments.

Here’s our complete guide on “How to See the Antares/Cygnus Jan. 8 Blastoff” – chock full of viewing maps and trajectory graphics (above and below) from a variety of prime viewing locations; including historic landmarks in Washington, DC., NYC, Baltimore, Philadelphia, Virginia and more.

The cold weather, daytime Antares liftoff is currently scheduled for 1:32 p.m. EST from Launch Pad 0A at the Mid-Atlantic Regional Spaceport (MARS) at NASA Wallops, Virginia.

Antares will be the 2nd of two private rockets soaring to space this week. And the path up is clear following today’s successful blastoff of the SpaceX upgraded Falcon 9 with the Thaicom-6 commercial telecom satellite.

Due to continuing extremely cold weather conditions forecast for mid week, the launch could slip a day to Thursday, Jan. 9 when slightly warmer temperatures are expected, but it looks acceptable at this time.

This flight was originally due to blastoff at night in mid-December 2013 but was postponed due to the unexpected need for urgent repairs to get the stations critical cooling system restored to full operation following a malfunction. The fixes were accomplished during a pair of pre-Christmas spacewalks by American astronauts Rick Mastracchio and Mike Hopkins, paving the way for the Antares/Cygnus rescheduled liftoff.

Antares rocket and Cygnus spacecraft at Launch Pad 0A at NASA Wallops Flight Facility Facility, VA. LADEE lunar mission launch pad 0B stands adjacent to right of Antares. Credit: Ken Kremer - kenkremer.com — Antares rocket and Cygnus spacecraft at Launch Pad 0A at NASA Wallops Flight Facility Facility, VA. LADEE lunar mission launch pad 0B stands adjacent to right of Antares. Credit: Ken Kremer – kenkremer.com

And although it’s now moved to daylight due to orbital mechanics, the two stage Antares rockets exhaust plume should easily be visible to many millions of residents up and down the US East Coast spanning from South Carolina to Massachusetts – weather permitting.

Antares will be able to be seen by spectators inland as well, reaching potentially into portions of West Virginia, western Pennsylvania and New England depending on cloud cover.

For example; Here’s the expected view from the US Capitol – for all the politicians who decide NASA’s budget as well as myriads of tourists visiting from all across the globe.

Capitol-East-Front-Steps — US Capitol- East Front Steps

The viewing maps are courtesy of Orbital Sciences, the private company that developed both the Antares rocket and Cygnus resupply vessel aimed at keeping the International Space Station (ISS) fully stocked and operational for science research.

Up top is the time of first sighting map showing when the rocket reaches 5 degrees of elevation in the eastern United States.

If you want to imitate Rocky’s famous workout on the steps of the Philadelphia Art Museum, here’s what you’ll see:

And with yet another cold arctic air mass gushing towards eastwards, its certain to be frigid in many regions – so be sure to dress warmly.

The flight is designated the Orbital-1, or Orb-1 mission.

Orb-1 is the first of eight commercial cargo resupply missions to the ISS by Orbital under its Commercial Resupply Services (CRS) contract with NASA.

This launch follows a pair of successful launches in 2013, including the initial test launch in April and the 1st demonstration launch to the ISS in September.

So here’s your chance to witness a mighty rocket launch – from the comfort of your home from locations along the east coast.

Best viewing of all will be in the mid-Atlantic region closest to Wallops Island.

If you have the opportunity to observe the launch locally, you’ll get a magnificent view and hear the rockets thunder at either the NASA Wallops Visitor Center or the Chincoteague National Wildlife Refuge/Assateague National Seashore.

For more information about the Wallops Visitors Center, including directions, see: http://www.nasa.gov/centers/wallops/visitorcenter

The rocket was rolled out to the Wallops launch pad on Sunday by Orbital’s technicians.

Cygnus pressurized cargo module - side view - during prelaunch processing by Orbital Sciences at NASA Wallops, VA. Credit: Ken Kremer - kenkremer.com — Cygnus pressurized cargo module – side view – during prelaunch processing by Orbital Sciences at NASA Wallops, VA. Docking mechanism to ISS at right. Credit: Ken Kremer – kenkremer.com

Of course you can still view the launch live via the NASA TV webcast.