Space and astronomy news
Sometimes you’ve just got to get away from it all. From your planet, your Solar System and your galaxy. If you’re looking to escape, you’ll need to know just what velocity it’ll take to break the surly bonds of gravity and punch the sky.
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2013 may well go down as “The Year of the Comet.” After over a decade punctuated by only sporadic bright comets such as 17P/Holmes, C/2011 W3 Lovejoy and C/2006 P1 McNaught, we’ve already had two naked eye comets visible this year by way of C/2012 F6 Lemmon and C/2011 L4 PanSTARRS. And of course, all eyes are on Comet C/2012 S1 ISON as it plunges towards perihelion on U.S. Thanksgiving Day, November 28th.
But there’s an “old faithful” of comets that’s currently in our solar neighborhood, and worth checking out as well. Comet 2P/Encke (pronounced EN-key) currently shines at magnitude +7.9 and is crossing from the constellation Leo Minor into Leo this week. In fact, Encke is currently 2 magnitudes— over 6 times brighter than Comet ISON —and is currently the brightest comet in our skies. Encke is expected to top out at magnitude +7 right around perihelion towards the end of November. Encke will be a fine binocular object over the next month, and once the Moon passes Last Quarter phase on October 26th we’ll once again have a good three week window for pre-dawn comet hunting. Comet Encke made its closest pass of the Earth for this orbit on October 17th at 0.48 Astronomical Units (A.U.s) distant. This month sees its closest passage to the Earth since 2003, and the comet won’t pass closer until July 11th, 2030.
This will be Comet Encke’s 62nd observed perihelion passage since its discovery by Pierre Méchain in 1786. Encke has the shortest orbit of any known periodic comet, at just 3.3 years. About every 33 years we get a favorable close pass of the comet, as last occurred in 1997, and will next occur in 2030.
But this year’s apparition of Comet Encke is especially favorable for northern hemisphere observers. This is due to its relatively high orbital inclination angle of 11.8 degrees and its passage through the morning skies from north of both the ecliptic and the celestial equator. Encke is about half an A.U. ahead of us in our orbit this month, crossing roughly perpendicular to our line of sight.
Note that Encke is also running nearly parallel to Comet ISON from our vantage point as they both make the plunge through the constellation Virgo into next month. Mark your calendars: both ISON and Encke will fit into a telescopic wide field of view around November 24th in the early dawn. Photo-op!
Here are some key dates to help you in your morning quest for Comet Encke over the next month:
-October 22nd: Crosses into the constellation Leo.
-October 24th: Passes near the +5.3 magnitude star 92 Leonis.
-October 25th: Passes near the +4.5 magnitude star 93 Leonis.
-October 27th: Passes briefly into the constellation Coma Berenices.
-October 29th: Passes near the +11th magnitude galaxy M98, and crosses into the constellation Virgo.
-October 30th: Passes near the +10th magnitude galaxy pair of M84 & M86.
-November 2nd: Passes between the two +5th magnitude stars of 31 and 32 Virginis.
-November 3rd: A hybrid solar eclipse occurs across the Atlantic and central Africa. It may just be possible to spot comet Encke with binoculars during the brief moments of totality.
-November 4th: Passes near the +3.4 magnitude star Auva (Delta Virginis).
-November 7th: Crosses from north to south over the celestial equator.
-November 11th: Passes near the +5.7th star 80 Virginis.
-November 17th: The Moon reaches Full, and enters into the morning sky.
-November 18th: Passes 0.02 A.U. (just under 3 million kilometers, or 7.8 Earth-Moon distances) from the planet Mercury. A good chance for NASA’s Messenger spacecraft to perhaps snap a pic of the comet?
-November 19th: Passes 1.5 degrees from Mercury and crosses into the constellation Libra.
-November 20th: Crosses to the south of the ecliptic plane.
-November 21st: Reaches perihelion, at 0.33 AU from the Sun.
-November 24th: Comet Encke passes just 1.25 degrees from Comet ISON. Both will have a western elongation of 15 degrees from the Sun.
-November 26th: Passes near the +4.5 magnitude star Iota Librae and the +6th magnitude star 25 Librae.
-December 1st: Crosses into the constellation Scorpius.
-December 5th: Enters into view of SOHO’s LASCO C3 camera.
Note: “Passes near” on the above list indicates a passage of Comet Encke less than one angular degree (about twice the size of a Full Moon) from an interesting object, except where noted otherwise.
Binoculars are your best bet for catching sight of Comet 2P/Encke. For middle northern latitude observers, Comet Encke reaches an elevation above 20 degrees from the horizon about two hours before local sunrise. Keep in mind, Europe and the U.K. “fall back” an hour to Standard Time this coming weekend on October 27th, and most of North America follows suit on November 3rd, pushing the morning comet vigil back an hour as well.
Two other comets are both currently brighter than ISON and also merit searching for: Comet C/2013 R1 Lovejoy, at +8.7th magnitude in Canis Minor, and Comet C/2012 X1 LINEAR, currently also in Coma Berenices and undergoing a minor outburst at magnitude +8.5.
Be sure to check these celestial wonders out as we prepare for the “Main Event” of Comet ISON in November 2013!
Welcome, come in to the 324th Carnival of Space! The carnival is a community of space science and astronomy writers and bloggers, who submit their best work each week for your benefit. I’m Susie Murph, the newest member of the team at Universe Today, and I’m both thrilled and intimidated to be hosting this week’s Carnival for you, Hopefully I can present these articles with the fanfare that they deserve, so now, on to the stories!
First up, the Chandra X-Ray Observatory site began the week by celebrating Ada Lovelace Day. Ada Lovelace is widely considered to be the first computer programmer, and this day is celebrated as an occasion to promote women and their achievements in science, technology, engineering and math (aka, STEM), and Chandra does just that through their series of blogs Women in the High Energy Universe. Check out these posts about the amazing contributions that these women have made to both the observatory but also the fields of scientific endeavor.
Then we have the Photospace.Com blog post about how scientists think that carbon is treated in the clouds of gas giants and the possibility of diamond rains on those and other planets with rings.
Next, we have the Space Frontier Foundation discussing important point in the movie ‘Gravity,’ – the very real threat of orbital debris. (Spoiler Alert if you haven’t yet seen the movie!) Even the smallest pieces of debris can be deadly, because they can be moving at 27,350 kilometers per hour (17,000 miles per hour), and there are possibly hundreds of thousands of objects, most too small to track, in Earth orbit. However, there are ideas being presented to try to reduce the problems that this debris causes, and with improvements in technology, hopefully the kinds of disasters depicted in the movie never happen in real life.
The next two articles are from Brian Wang over at the Next Big Future blog.
First up, SpaceX reviews the September 29 test of the upgraded Falcon rocket , in which they completed several important milestones along the way to being certified for use by the U.S. Air Force for National Security Space missions, as well as the more difficult challenges of full recovery of the boost stage.
Next, as we celebrate Columbus’ voyage to the New World, Brian muses on what it would take to be the “Columbus of the Space Age.” He highlights the development of colonies that led to permanent populations, and gives some numbers on how we could quantify success for a modern-age explorer.
For the next article, we go over to the AARTScope Blog, for Peter Lake’s article about the discovery of Asteroid 2013 TV135 on October 8th. This asteroid was discovered after it missed the Earth by 6.7 million Km, and is predicted to return for a close approach to Earth in 2032. It has been initially listed as a “virtual impactor,” but with more observations, this categorization is likely to change.
Then we visit the Meridiani Journal for Paul Scott Anderson’s article on the upcoming mission to Mars from the Indian Space Research Organization (ISRO) on October 28. The spacecraft, dubbed Mangalyaan, is an upgraded version of Chandrayaan 1, and will study the Martian surface and atmosphere with its five payload instruments, including one that will sense the presence of methane.
And finally, we return here to Universe Today, to read Elizabeth Howell’s article about the discovery of the remains of a water-filled asteroid circling a dying white dwarf about 150 light years away from Earth. The discovery is considered very exciting, because it shows that the components that make life as we know it possible, such as liquid water on a rocky surface, are present in other solar systems.
That’s it for this week’s Carnival. See you all next time!
With two days left before Planck switches off forever, the European Space Agency re-posted this beautiful image the telescope recently assisted in taking. It shows the Shapley Supercluster, which ESA describes as the biggest cosmic structure in our neighborhood.
First discovered in the 1930s by Harlow Shapley, a U.S. astronomer, the structure has more than 8,000 galaxies and a mass that is 10 million billion times that the mass of the Sun, ESA added. The blue parts are detections by Planck, and the Rosat satellite imaged the pink sections. Visible wavelengths shown in the picture come from the Digitised Sky Survey.
Today (Oct. 21), ESA will order Planck to run its thrusters to empty. After years hovering at a Lagrange point, the telescope will be put in a “parking orbit” to circle the sun, keeping it away from the Earth and moon for at least several centuries. The last command will be sent Oct. 23.
Among other milestones, Planck released a cosmic map in March refining the Universe’s age to 13.82 billion years.
The crowdfunding campaign is off to a slow start, but the PHASST-1 telescope still has more than a month to reach its $88,816 (€65,000) goal of deploying telescopes devoted to searching for near-Earth asteroids.
The Potentially Hazardous Asteroid Search & Tracking Telescope, as the acronym stands for, will begin with two telescopes: an f/1 Baker-Nunn camera near Arequipa, Peru and a 50cm f/3.6 astrograph near Ager, Spain.
“Even though PHASTT-1 will have a large field of view compared to most telescopes (~5x) of a similar aperture, competing in the area of asteroid search is difficult due to a large number of teams doing similar work. Because of this, we are designing PHASTT-1 as not only a search telescope but also as a followup and characterization instrument — two key areas where we can make an impact,” the IndieGogo campaign page states.
“Follow-up observations are important as they help us refine the orbits of potentially hazardous objects and narrow the uncertainties around how close an asteroid will come to the Earth. Characterization of asteroids is also important as it helps us understand the physical properties of asteroids. This understanding critical if we want to know how to best deal with a ‘rogue’ asteroid that is on an impact course or if we just want to know which asteroids would make for interesting near-Earth exploration targets.”
The principles including astronomers, a technology consultant and a laser ranging specialist. You can read more technical details on the IndieGogo campaign page or the PHASTT-1 website. If they get the money they need, they aim to be operational by the middle of next year. The campaign completes Nov. 26.
Sunday’s Virtual Star Party felt like a reunion, with Mike Phillips, Gary Gonella, and Roy Salisbury supplying images and Scott Lewis co-hosting. We were joined by newcomer James McGee streaming a beautiful view of the Moon – when it wasn’t blocked by his apartment tower.
The Moon was just past full, so it commanded attention, but we still got a beautiful view of some fainter nebulae, galaxies and star clusters.
Astronomers: Mike Phillips, Gary Gonella, Roy Salisbury, James McGee
Hosts: Fraser Cain, Scott Lewis
Objects: The Moon, Pac Man Nebula, Eagle Nebula, Swan Nebula, Lagoon Nebula, Andromeda Galaxy, M15 globular cluster, Dumbbell Nebula, Veil Nebula and more.
We hold the Virtual Star Party every Sunday night when it gets dark on the West Coast of North America. You can watch it live on Universe Today, on Google+, or from the Universe Today YouTube Channel.
Another name for Mars is the Red Planet, and if you’ve ever seen it in the sky when the planet is bright and close to Earth, it appears like a bright red star. In Roman mythology, Mars was the god of war, so… think blood.
Even photos from spacecraft show that it’s a rusty red color. The hue comes from the fact that the surface is *actually* rusty, as in, it’s rich in iron oxide.
Iron left out in the rain and will get covered with rust as the oxygen in the air and water reacts with the iron in the metal to create a film of iron oxide.
Mars’ iron oxide would have formed a long time ago, when the planet had more liquid water. This rusty material was transported around the planet in dust clouds, covering everything in a layer of rust. In fact, there are dust storms on Mars today that can rise up and consume the entire planet, obscuring the entire surface from our view. That dust really gets around.
But if you look closely at the surface of Mars, you’ll see that it can actually be many different colours. Some regions appear bright orange, while others look more brown or even black. But if you average everything out, you get Mars’ familiar red colour.
If you dig down, like NASA’s Phoenix Lander did in 2008, you get below this oxidized layer to the rock and dirt beneath. You can see how the tracks from the Curiosity Rover get at this fresh material, just a few centimeters below the surface. It’s brown, not red.
And if you could stand on the surface of Mars and look around, what colour would the sky be? Fortunately, NASA’s Curiosity Rover is equipped with a full colour camera, and so we can see roughly what the human eye would see.
The sky on Mars is red too.
The sky here is blue because of Raleigh scattering, where blue photons of light are scattered around by the atmosphere, so they appear to come from all directions. But on Mars, the opposite thing happens. The dust in the atmosphere scatters the red photons, makes the sky appear red. We have something similar when there’s pollution or smoke in the air.
But here’s the strange part. On Mars, the sunsets appear blue. The dust absorbs and deflects the red light, so you see more of the blue photons streaming from the Sun. A sunset on Mars would be an amazing event to see with your own eyes. Let’s hope someone gets the chance to see it in the future.
We have written many articles about Mars on Universe Today. Here’s an article about a one-way, one-person trip to Mars, and here’s another about how scientists know the true color of planets like Mars.
Here are some nice color images captured of the surface of Mars from NASA’s Pathfinder mission, and here’s another explainer about why Mars is red from Slate Magazine.
We have recorded several podcasts just about Mars. Including Episode 52: Mars and Episode 92: Missions to Mars, Part 1.
Sources:
http://quest.arc.nasa.gov/qna/questions/FAQ_GeneraL_Mars.htm
http://mpfwww.jpl.nasa.gov/programmissions/missions/past/pathfinder/
http://www.slate.com/id/2093779/
NASA’s new LADEE spacecraft successfully entered lunar orbit, is operating beautifully and has begun shooting its radical laser communications experiment despite having to accomplish a series of absolutely critical do-or-die orbital insertion engine firings with a “skeleton crew ” – all this amidst the NASA and US government shutdown, NASA Ames Research Center Director Pete Worden told Universe Today in a LADEE mission exclusive.
During the two and a half week long NASA shutdown, engineers had to fire LADEE’s maneuvering thrusters three times over six days – first to brake into elliptical orbit about the Moon and then lower it significantly and safely into a circular commissioning orbit.
“All burns went super well,” Ames Center Director Worden told me exclusivly. And he is extremely proud of the entire team of “dedicated” professional men and women who made it possible during the shutdown.
“It says a lot about our people’s dedication and capability when a skeleton crew can get a new spacecraft into lunar orbit and fully commissioned in the face of a shutdown!” Worden said to Universe Today.
“I’m really happy that everyone’s back.”
After achieving orbit, a pair of additional engine burns reduced LADEE’s altitude and period into its initial commissioning orbit and teams began the month long activation and instrument checkout phase.
“We are at the commissioning orbit of 250 km,” said Worden.
And to top all that off, LADEE’s quartet of science instruments are checked out and the ground – breaking laser communications experiment that will bring about a quantum leap in transmitting space science data has already begun its work!
“All instruments are fully checked out with covers deployed.”
“We’ve begun the Lunar Laser Communications Demonstration (LLCD) tests and its working very well,” Worden explained.
And that’s the whole point of the LADEE mission in the first place.
97% of NASA’s employees were furloughed during the utterly chaotic and wasteful partial shutdown of the US government that lasted from Oct. 1 to Oct. 17 and also temporarily threatened the upcoming launch of NASA’s next mission to Mars – the MAVEN orbiter.
However, orbital mechanics follows the natural laws of the Universe, continues unabated and waits for no one in Washington, D.C.
NASA’s Jupiter-bound Juno orbiter also flew by Earth amidst the DC shutdown showdown on Oct. 9 for a similarly critical do-or-die gravity assisted speed boost and trajectory targeting maneuver.
The stakes were extremely high for NASA’s Lunar Atmosphere and Dust Environment Explorer (LADEE) mission because the spacecraft was on course for the Moon and absolutely had to ignite its main engine on the Sunday morning of Oct. 6.
There were no second chances. If anything failed, LADEE would simply sail past the Moon with no hope of returning later.
So, mission controllers at NASA Ames commanded LADEE to ignite its main engine and enter lunar orbit on Oct. 6 following the spectacular Sept. 6 night launch from NASA’s Wallops Island spaceport in Virginia.
The approximately four minute long burn know as Lunar Orbit Insertion burn 1 (LOI-1) began with LADEE’s arrival at the Moon following three and a half long looping orbits of the Earth.
LOI-1 changed the spacecrafts velocity by 329.8 meters/sec so that the couch sized probe could be captured by the Moon’s gravity and be placed into a 24 hour polar elliptical orbit.
The LOI-2 maneuver on Oct. 9 put LADEE into a 4-hour elliptic lunar orbit. The third and final LOI-3 burn occurred on Oct. 12, and put the spacecraft into the 2-hour commissioning orbit (roughly 235 Km x 250 Km), according to a NASA statement.
The 844 pound (383 kg) robot explorer was assembled at NASA’s Ames Research Center, Moffett Field, Calif., and is a cooperative project with NASA Goddard Spaceflight Center in Maryland.
“LADEE is the first NASA mission with a dedicated laser communications experiment,” said Don Cornwell, mission manager for the Lunar Laser Communications Demonstration (LLCD), NASA’s Goddard Space Flight Center, Greenbelt, Md, during an interview with Universe Today at the LADEE launch.
“With the LLCD experiment, we’ll use laser communications to demonstrate at least six times more data rate from the moon than what we can do with a radio system with half the weight and 25 percent less power,” said Cornwell.
The LLCD will be operated for about 30 days during the time of the commissioning orbit period.
The purpose of LADEE is to collect data that will inform scientists in unprecedented detail about the ultra thin lunar atmosphere, environmental influences on lunar dust and conditions near the surface. In turn this will lead to a better understanding of other planetary bodies in our solar system and beyond.
The $280 million probe is built on a revolutionary ‘modular common spacecraft bus’, or body, that could dramatically cut the cost of exploring space and also be utilized on space probes to explore a wide variety of inviting targets in the solar system.
“LADEE is the first in a new class of interplanetary exploration missions,” NASA Ames Director Worden told Universe Today. “It will study the pristine moon to study significant questions.”
“This is probably our last best chance to study the pristine Moon before there is a lot of human activity there changing things.”
Stay tuned here for continuing LADEE news
This week for the Weekly Space Hangout, we were joined by an impressive team of space journalists and special guest John Zeller, the Founder of Space Advocates – they’re best known for their Penny4NASA campaign.
We discussed the government shutdown, cool reusable spacecraft and electric aircraft, exoplanets, non-killer asteroids, tilted planets and much much more.
Host: Fraser Cain
Special Guest: John Zeller, Founder of Space Advocates
Journalists: Alan Boyle, Brian Wang, David Dickinson, Elizabeth Howell
Government Shutdown Ends
SpaceX Reusable Spacecraft
Kepler Tilted Planets
1000 Exoplanets
Microairports with Electric VTOL Aircraft
Asteroid 2013 TV135
Upcoming Lunar Eclipse
Upcoming Solar Eclipse
We organize the Weekly Space Hangout every Friday afternoon at 12:00 pm Pacific / 3:00 pm Eastern. You can watch it on Universe Today, Google+ or the Universe Today YouTube channel.
Warped visions of the cosmic microwave background – the earliest detectable light – allow astronomers to map the total amount of visible and invisible matter throughout the universe.
Roughly 85 percent of all matter in the universe is dark matter, invisible to even the most powerful telescopes, but detectable by its gravitational pull.
In order to find dark matter, astronomers look for an effect called gravitational lensing: when the gravitational pull of dark matter bends and amplifies light from a more distant object. In its most eccentric form it results in multiple arc-shaped images of distant cosmic objects.
But there’s one caveat here: in order to detect dark matter there must be an object directly behind it. The ‘stars’ have to be aligned.
In a recent study led by Dr. James Geach of the University of Hertfordshire in the United Kingdom, astronomers have set their eyes on the cosmic microwave background (CMB) instead.
“The CMB is the most distant/oldest light we can see,” Dr. Geach told Universe Today. “It can be thought of as a surface, backlighting the entire universe.”
The photons from the CMB have been hurling toward the Earth since the universe was only 380,000 years old. A single photon has had the chance to run into plenty of matter, having effectively probed all the matter in the universe along its line of sight.
“So our view of the CMB is a bit distorted from what it intrinsically looks like – a bit like looking at the pattern on the bottom of a swimming pool,” Dr. Geach said.
By noting the small distortions in the CMB, we can probe all of the dark matter throughout the entire universe. But doing just this is extremely challenging.
The team observed the southern sky with the South Pole Telescope, a 10 meter telescope designed for observations in the microwave. This large, groundbreaking survey produced a CMB map of the southern sky, which was consistent with previous CMB data from the Planck satellite.
The characteristic signatures of gravitational lensing by intervening matter can not be extracted by eye. Astronomers relied on the use of a well-developed mathematical procedure. We wont go into the nasty details.
This produced a “map of the total projected mass density between us and the CMB. That’s quite incredible if you think about it – it’s an observational technique to map all of the mass in the universe, right back to the CMB,” Dr. Geach explained.
But the team didn’t finish their analysis there. Instead, they continued to measure the CMB lensing at the positions of quasars – powerful supermassive black holes in the centers of the earliest galaxies.
“We found that regions of the sky with a large density of quasars have a clearly stronger CMB lensing signal, implying that quasars are indeed located in large-scale matter structures,” Dr. Ryan Hickox of Dartmouth College – second author on the study – told Universe Today.
Finally, the CMB map was used to determine the mass of these dark matter halos. These results matched those determined in older studies, which looked at how the quasars clustered together in space, with no reference to the CMB at all.
Consistent results between two independent measurements is a powerful scientific tool. According to Dr. Hickox, it shows that “we have a strong understanding of how supermassive black holes reside in large-scale structures, and that (once again) Einstein was right.”
The paper has been accepted for publication in the Astrophysical Journal Letters and is available for download here.