Posted on by Nancy Atkinson

Are Dust Devils Whirling Around the Curiosity Rover?

In this latest update from the MSL team, Ashwin Vasavada, the Deputy Project Scientist, explains how Curiosity has been monitoring the winds and radiation levels in Gale Crater. Curiosity has also been looking for dust devils — the small dust storms that have been seen by other spacecraft as they whirl around Mars. While Curiosity hasn’t been able to ‘see’ them by taking images directly, other instruments indicate dust devils may be whirling right over the rover.

The team said that during the first 12 weeks after Curiosity landed in Gale Crater, they have analyzed data from more than 20 atmospheric events with at least one characteristic of a whirlwind recorded by the Rover Environmental Monitoring Station (REMS) instrument. Those characteristics can include a brief dip in air pressure, a change in wind direction, a change in wind speed, a rise in air temperature or a dip in ultraviolet light reaching the rover. Two of the events included all five characteristics.

Vasavada said that the winds blow from all directions where the rover sits, in between the central mound of Gale Crater (Aeolis Mons/Mt. Sharp) and the rim of the crater, which makes it an area ripe for dust devils.

Vasavada also points out that the Spirit and Opportunity rovers were able to capture dust devils in their own vicinity, which was an exciting accomplishment. Curiosity’s MastCams can take 720p (1280×720 pixels) high-definition video at a rate of about 10 frames per second, so if the team was ever lucky enough to capture a dust devil in action, it would be our best-ever view of a dust devil on the surface of Mars, and would be tremendously exciting.

Here’s a huge dust devil captured from orbit by the HiRISE camera on the Mars Reconnaissance Orbiter:

A Martian dust devil roughly 12 miles (20 kilometers) high was captured winding its way along the Amazonis Planitia region of Northern Mars on March 14, 2012 by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA’s Mars Reconnaissance Orbiter. Despite its height, the plume is little more than three-quarters of a football field wide (70 yards, or 70 meters). Image credit: NASA/JPL-Caltech/UA

Posted on by Nancy Atkinson

2012 Leonid Meteor Shower Peaks This Weekend

Early Leonids captured on Nov. 14, 2012 in Ohio. Credit: John Chumack

The annual Leonid Meteor Shower has already begun, according to astrophotographer John Chumack in Ohio, who said he captured a dozen or so via his night sky video cameras earlier this week. But the peak for the Leonids this year is expected to be this weekend, and the best viewing should be during the hours before dawn on November 17, according to the editors of StarDate magazine at the University of Texas at Austin McDonald Observatory

Every year about this time Earth passes through the debris field left by Comet Tempel-Tuttle. The tiny grains of dust enter Earth’s atmosphere and burn up, sometimes leaving glowing dust trails, which we call meteors.

Graphic via StarDate magazine of the Leonid meteor shower.

If you wait until the hours before dawn this weekend, the Moon will be below the horizon, so its light will not interfere with seeing meteors. Astronomers says that with clear skies, viewers can expect to see about 15 to 20 meteors per hour, though the shower has proved highly variable in recent years.

Though the meteors will appear to originate from the constellation Leo, which will be in the eastern sky in the early morning hours, the meteors can be seen in all parts of the sky.

If you capture any images of the meteor shower, share them with Universe Today by uploading them on our Flickr group or send us your images by email (this means you’re giving us permission to post them). Please explain what’s in the picture, when you took it, the equipment you used, etc.

Here’s another look at John Chumack’s early Leonids.

Posted on by Nancy Atkinson

Now Even Further: Ancient Galaxy is Latest Candidate for Most Distant

It seems that every few months or so comes a new discovery of a new “most distant galaxy ever found.” It’s not really a surprise that new benchmarks are reached with such an amazing frequency as our telescopes get better and astronomers refine their techniques for observing faraway and ancient objects. This latest “most distant” is pretty interesting in that it was found by combining observations from two space telescopes – Hubble and Spitzer – as well as using massive galaxy clusters as gravitational lenses to magnify the distant galaxy behind them. It’s also extremely small and may not even be a fully developed galaxy at the time we are seeing it.

While this galaxy, named MACS0647-JD, appears as a diminutive blob in the new images, astronomers say it offers a peek back into a time when the universe was just 3 percent of its present age of 13.7 billion years. This newly discovered galaxy was observed 420 million years after the Big Bang, and its light has traveled 13.3 billion years to reach Earth.

“This object may be one of many building blocks of a galaxy,” said Dan Coe of the Space Telescope Science Institute, lead author of a new paper on the observations. “Over the next 13 billion years, it may have dozens, hundreds, or even thousands of merging events with other galaxies and galaxy fragments.”

The discovery comes from the Cluster Lensing And Supernova Survey with Hubble (CLASH), a program that combines the power of space telescopes with the natural zoom of gravitational lensing to reveal distant galaxies in the early Universe. Observations with Spitzer’s infrared eyes allowed for confirmation of this object.

The light from MACS0647-JD was magnified by a massive galaxy cluster named MACS J0647+7015, and without the cluster’s magnification powers, astronomers would not have seen the remote galaxy. Because of gravitational lensing, the CLASH research team was able to observe three magnified images of MACS0647-JD with the Hubble telescope. The cluster’s gravity boosted the light from the faraway galaxy, making the images appear about eight, seven, and two times brighter than they otherwise would that enabled astronomers to detect the galaxy more efficiently and with greater confidence.

“This cluster does what no manmade telescope can do,” said Marc Postman, also from STScI. “Without the magnification, it would require a Herculean effort to observe this galaxy.”

MACS0647-JD is just a fraction of the size of our Milky Way galaxy, and is so small it may not even be a fully formed galaxy. Data show the galaxy is less than 600 light-years wide. Based on observations of somewhat closer galaxies, astronomers estimate that a typical galaxy of a similar age should be about 2,000 light-years wide. For comparison, the Large Magellanic Cloud, a dwarf galaxy companion to the Milky Way, is 14,000 light-years wide. Our Milky Way is 150,000 light-years across.

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The galaxy was observed with 17 filters, spanning near-ultraviolet to near-infrared wavelengths, using Hubble’s Wide Field Camera 3 (WFC3) and Advanced Camera for Surveys (ACS). Coe discovered the galaxy in February while poring over a catalogue of thousands of gravitationally lensed objects found in Hubble observations of 17 clusters in the CLASH survey. But the galaxy appeared only in the two reddest filters.

“So either MACS0647-JD is a very red object, only shining at red wavelengths, or it is extremely distant and its light has been ‘redshifted’ to these wavelengths, or some combination of the two,” Coe said. “We considered this full range of possibilities.”

The CLASH team identified multiple images of eight galaxies lensed by the galaxy cluster. Their positions allowed the team to produce a map of the cluster’s mass, which is primarily composed of dark matter. Dark matter is an invisible form of matter that makes up the bulk of the universe’s mass. “It’s like a big puzzle,” said Coe. “We have to arrange the mass in the cluster so that it deflects the light of each galaxy to the positions observed.” The team’s analysis revealed that the cluster’s mass distribution produced three lensed images of MACS0647-JD at the positions and relative brightness observed in the Hubble image.

Coe and his collaborators spent months systematically ruling out these other alternative explanations for the object’s identity, including red stars, brown dwarfs, and red (old or dusty) galaxies at intermediate distances from Earth. They concluded that a very distant galaxy was the correct explanation.

Redshift is a consequence of the expansion of space over cosmic time. Astronomers study the distant universe in near-infrared light because the expansion of space stretches ultraviolet and visible light from galaxies into infrared wavelengths. Coe estimates MACS0647-JD has a redshift of 11, the highest yet observed.

Images of the galaxy at longer wavelengths obtained with the Spitzer Space Telescope played a key role in the analysis. If the object were intrinsically red, it would appear bright in the Spitzer images. Instead, the galaxy barely was detected, if at all, indicating its great distance. The research team plans to use Spitzer to obtain deeper observations of the galaxy, which should yield confident detections as well as estimates of the object’s age and dust content.

MACS0647-JD galaxy, however, may be too far away for any current telescope to confirm the distance based on spectroscopy, which spreads out an object’s light into thousands of colors. Nevertheless, Coe is confident the fledgling galaxy is the new distance champion based on its unique colors and the research team’s extensive analysis. “All three of the lensed galaxy images match fairly well and are in positions you would expect for a galaxy at that remote distance when you look at the predictions from our best lens models for this cluster,” Coe said.

The new distance champion is the second remote galaxy uncovered in the CLASH survey, a multi-wavelength census of 25 hefty galaxy clusters with Hubble’s ACS and WFC3. Earlier this year, the CLASH team announced the discovery of a galaxy that existed when the universe was 490 million years old, 70 million years later than the new record-breaking galaxy. So far, the survey has completed observations for 20 of the 25 clusters.

The team hopes to use Hubble to search for more dwarf galaxies at these early epochs. If these infant galaxies are numerous, then they could have provided the energy to burn off the fog of hydrogen that blanketed the universe, a process called re-ionization. Re-ionization ultimately made the universe transparent to light.

Read the team’s paper (pdf).

Sources: HubbleSite, ESA Hubble

Posted on by Nancy Atkinson

Spacecraft Capture Solar Eclipse’s Earthly Effect

Series of images from the Japanese MTSAT satellite showing a shadow on Earth during the total solar eclipse on November 13/14. 2012. Credit: JAXA

A Japanese meteorology satellite captured the moving shadow from the total solar eclipse this week, and this animated series of images shows the shadow moving east-southeast across northeastern Australia and into the waters of the South Pacific Ocean. The images were taken by the MTSAT-1R in the 0.7 micrometer visible channel, as the Moon moved between the Sun and the Earth, blocking the Sun’s light. (Click on the image above if it is not animating in your browser).

The solar eclipse shadow was also visible from an image taken by the Korean COMS-1 satellite, and one of the GOES satellites operated by NASA and NOAA, seen below.


Image taken from the Korean COMS-1 satellite during the total solar eclipse on November 13/14. 2012.

Starting just after dawn in Australia, the eclipse cast a 150-kilometer (95-mile) shadow in Australia’s Northern Territory, crossed the northeast tip of the country and moved out across the South Pacific. As this was a total solar eclipse, the Moon completely covered the Sun, with just the Sun’s corona peeking out around the rim; totality lasted about 2 minutes. A partial eclipse was visible from east Indonesia, the eastern half of Australia, New Zealand, Papua New Guinea and southern parts of Chile and Argentina.

Image from the GOES-15 satellite showing the eclipse’s shadow on Earth. Credit: NASA/NOAA

See our gallery of images from people on the ground in Australia during the eclipse.

Source: University of Wisconsin-Madinson/CIMSS

Posted on by Nancy Atkinson

Explore the Stellar Neighborhood with New Milky Way Visualization

Screenshot from 100,000 Stars

Want to explore the Milky Way? A new visualization tool from Google called 100,000 Stars lets you take a tour of our cosmic neighborhood, and with a few clicks of your mouse you can zoom in, out and around and do a little learning along the way. Zoom in to learn the names of some of the closest stars; click on the names to find out more information about them.

Playing with it is great fun, and I’ve been experimenting with it for a while. The most important caveat about 100,000 Stars is that you need to run it in Chrome. It’s from the Chrome Experiment team, and it uses imagery and data from NASA and ESA, but the majority of what you are seeing are artist’s renditions.

The best way to get started is to click on the Take the Tour in the upper left hand corner.

But if you just want to zoom in, you can see the closest stars to us. The Sun is in the middle, and if you zoom in even further, you’ll see the Oort Cloud. Keep zooming in to find the planetary orbits (I was struck by how much zooming had to be done to get to the planets, giving a sense of scale).

It includes some nifty spacey-like music (provided by Sam Hulick, who video game fans may recognize as a composer for the popular space adventure series, Mass Effect) but if you’d rather explore in silence, hit your mute button.

What I enjoyed the most is moving my mouse up and down to see the 3-D effect of how everything fits together, providing a sense of the cosmic web that holds our universe together.

Check out 100,000 Stars

Posted on by Nancy Atkinson

This Day in Space History: Apollo 12 and SCE to AUX

John Aaron in Mission Control. Credit: NASA

On this day in history, on November 14, 1969, Apollo 12 successfully launched to the Moon. But it wasn’t without a little drama. The weather that day at Cape Canaveral in Florida was overcast with light rain and winds. However, at 11:22 am EST, the spacecraft, carrying astronauts Pete Conrad, Dick Gordon, and Alan Bean, blasted off into the clouds, in a seemingly perfect launch.

But thirty-seven seconds into launch, all hell broke loose.

“What the hell was that?” asked Gordon. Twenty seconds of confusion ensued, and then another disturbance occurred.

Continue reading “This Day in Space History: Apollo 12 and SCE to AUX”
Posted on by Nancy Atkinson

Spacecraft Witnesses Solar Eclipse x 3

On the ground, the total solar eclipse of November 13/14, 2012 was only visible to only to observers in northern Australia. But ESA’s Sun-watching satellite Proba-2 enjoyed three partial eclipses from its vantage point in space.

During a total solar eclipse, the Moon moves in front of the Sun as seen from Earth, their alignment and separation such that the much closer Moon appears large enough to block out the light from the much more distant Sun.

Since Proba-2 orbits Earth about 14.5 times per day, it can dip in and out of the Moon’s shadow around the time of a solar eclipse. The constant change in viewing angle of Proba-2 meant that the satellite passed through the shadow three times during the eclipse yesterday, as shown in the video above.

ESA says the apparent noise in the movie results from high energy particles hitting Proba-2’s electronics as the spacecraft passes through the South Atlantic Anomaly. The dimming in the movie is an effect as part of the satellite’s orbit passes through the shadow of the Earth.

Proba-2 image of the solar disc taken during the total eclipse of July 2010, combined with ground-based images taken at the same time to reveal the exquisite details of the solar corona. Credit: ESA

Read more about Proba-2’s day of eclipses from ESA.

Posted on by Nancy Atkinson

New Rogue Planet Found, Closest to our Solar System

This artist’s impression shows the free-floating planet CFBDSIR J214947.2-040308.9. Credit: ESO/L. Calçada/P. Delorme/Nick Risinger/R. Saito/VVV Consortium

Rogue planets – also known as free floating planets – are pretty intriguing. They are not orbiting a star but instead are wandering through the galaxy, having been either forcibly ejected from a solar system or having formed very early on in the Universe. While only a handful of these planets have been actually found, astronomers estimate these vagrant worlds could vastly outnumber stars. In fact, it’s been suggested there could be 100,000 times more rogue planets than stars in our Milky Way galaxy alone!

The latest rogue world to be found is exciting in that it is the closest such object to our Solar System so far. At a distance of about 100 light-years, its comparative proximity, along with the absence of a bright star very close to it, has allowed the team to study its atmosphere in great detail. Astronomers say this object gives them a preview of the exoplanets that future instruments will be able to find – and potentially take image of — around stars other than the Sun. But the planet also seems to be loosely tied to a roving group of stars, called the AB Doradus Moving Group.

The new rogue planet, with the ungainly name of CFBDSIR J214947.2-040308.9 (CFBDSIR2149 for short), was found using the Very Large Telescope and the Canada-France-Hawaii Telescope. The astronomers, led by Philippe Delorme from the Institut de planétologie et d’astrophysique de Grenoble, CNRS/Université Joseph Fourier, France, are calling the object a rogue planet candidate for now, as they want to study it further to confirm its free-floating status.

Moving star systems are equally intriguing. The AB Doradus Moving Group is the closest such group to our Solar System, and the stars drift through space together in a pack. They are thought to have formed at the same time. If the new rogue planet actually is associated with this moving group, astronomers say it will be possible to deduce much more about it, including its temperature, mass, and what its atmosphere is made of. There remains a small probability that the association with the moving group is by chance.

The link between the new object and the moving group is the vital clue that allows astronomers to find the age of the newly discovered object. Without knowing its age, it’s not possible to know whether it is really a planet, or a brown dwarf, a “failed” star that lack the bulk to trigger the reactions that make stars shine.

This is the first isolated planetary mass object ever identified in a moving group, and the association with this group makes it the most interesting free-floating planet candidate identified so far.

This closeup of an image captured by the SOFI instrument on ESO’s New Technology Telescope at the La Silla Observatory shows the free-floating planet CFBDSIR J214947.2-040308.9 in infrared light. This object, which appears as a faint blue dot at the centre of the picture, is the closest such object to the Solar System. Credit: ESO/P. Delorme.

“Looking for planets around their stars is akin to studying a firefly sitting one centimetre away from a distant, powerful car headlight,” said Delorme. “This nearby free-floating object offered the opportunity to study the firefly in detail without the dazzling lights of the car messing everything up.”

Free-floating objects like CFBDSIR2149 are thought to form either as normal planets that have been booted out of their home systems, or as lone objects like the smallest stars or brown dwarfs. In either case these objects are intriguing — either as planets without stars, or as the tiniest possible objects in a range spanning from the most massive stars to the smallest brown dwarfs.

“These objects are important, as they can either help us understand more about how planets may be ejected from planetary systems, or how very light objects can arise from the star formation process,” says Philippe Delorme. “If this little object is a planet that has been ejected from its native system, it conjures up the striking image of orphaned worlds, drifting in the emptiness of space.”

If CFBDSIR2149 is not associated with the AB Doradus Moving Group, the astronomers say it is trickier to be sure of its nature and properties, and it may instead be characterized as a small brown dwarf. Both scenarios represent important questions about how planets and stars form and behave.

“Further work should confirm CFBDSIR2149 as a free-floating planet,” said Delorme. “This object could be used as a benchmark for understanding the physics of any similar exoplanets that are discovered by future special high-contrast imaging systems, including the SPHERE instrument that will be installed on the VLT.”

This video shows an artist’s impression of the free-floating planet CFBDSIR J214947.2-040308.9. In the first part of the sequence the planet appears as a dark disc in visible light, silhouetted against the star clouds of the Milky Way. This is the closest such object to the Solar System and the most exciting candidate free-floating planet found so far. It does not orbit a star and hence does not shine by reflected light; the faint glow it emits can only be detected in infrared light. In the final sequence we see an infrared view of the object with the central parts of the Milky Way as seen by the VISTA infrared survey telescope as background. The object appears blueish in this near-infrared view because much of the light at longer infrared wavelengths is absorbed by methane and other molecules in the planet’s atmosphere. In visible light the object is so cool that it would only shine dimly with a deep red colour when seen close-up.

Read the team’s research paper here (pdf).

Source: ESO

Posted on by Nancy Atkinson

Total Solar Eclipse, November 2012: Images and Video

View of the eclipse from Clifton Beach in Queensland, Australia. Credit: Camilla the Rubber Chicken

Here are some images and video from the total solar eclipse from today, November 13/14, 2012 (depending on where you were), which was visible only from the northern part of Australia. The image above comes from Camilla_SDO, the mascot of the Solar Dynamics Observatory mission. “Clifton Beach was cheering during the totality and Diamond Ring,” Camilla tweeted.

We’ll be adding more images as they become available.

This video comes via a TV news station in New Zealand:

Here are some photos via Robert Hollow, education and public outreach specialist who traveled to Maitland Downs in Queensland, Australia with the “Under a Darkened Star” Student Astronomy Conference, sponsored by the Commonwealth Scientific and Industrial Research Organisation (CSIRO):

Totality from Maitland Downs. Credit: Robert Hollow/CSIRO.

An eclipsed Sun rises over a ridge in Maitland Downs, Queensland, Australia. Credit: Robert Hollow/CSIRO.

A ‘wedding ring’ at end of totality from Maitland Downs. Credit: Robert Hollow/CSIRO

A view of the Sun after totality through a refractor telescope. Credit: Robert Hollow/CSIRO

Screenshot from the webcast feed from Cairns and the Great Barrier Reef, Australia at 20:30 UTC.

A montage of the Solar Eclipse, sent in by Julia, as seen from Adelaide, South Australia. Click to see a larger version.

Daniel Fischer traveled to Australia to watch the eclipse, and described the experience as “Pure drama with complicated clouds – slender solar crescents seen moments before C2 and after C3 but totality was invisible.” Here are a few of his images:

Eclipse watchers at Wangetti Beach in Queensland, Australia. Credit: Daniel Fischer.

Approaching totality, through the clouds at Wangetti Beach in Queensland, Australia. Credit: Daniel Fischer.

A sliver of a crescent, nearing totality with more clouds at Wangetti Beach in Queensland, Australia. Credit: Daniel Fischer.

A clouded out eclipse. Credit: Ian Musgrave.

Ian Musgrave from Adelaide, Australia traveled to Cairns in Queensland just for the eclipse, and was completely clouded out, but still took this interesting picture. “The sky went eerily dark, and the patch of sun on the sea went out,” he wrote on his blog. “Afterwards, the cloud went away just as the Sun appeared from behind the Moon. Amazing.”

Below is a group of images from Shahrin Ahmad, who wrote us, “With the weather in Cairns not promising, we decided to go inland to Mareeba, with a slightly shorter eclipse totality duration of 1 minute 39 seconds. We were lucky because the sky here was clear and free from clouds. With the Moon so low to the horizon, this eclipse seems ‘larger’ than usual, due to the Moon Illusion effect. It was certainly a spectacular eclipse!”

Diamond Ring effect seen at Mareeba. Credit: Shahrin Ahmad

Just moments before second contact. Credit: Shahrin Ahmad

Prominences, loops of plasma are seen emanating from the Sun’s limb during the eclipse. Credit: Shahrin Ahmad

Moonshadow. Credit: Shahrin Ahmad

More images from the webcasts:

Screenshot from the Panasonic feed from Fitzroy Island during totality.

Screenshot of NASA’s eclipse webcast feed just the Sun emerged from totality over Palm Cove, Australia. Via Jason Major.

Screenshot of the feed from Fitzroy Island at 20:18 UTC.

Posted on by Nancy Atkinson

SETI: The Search Goes On

In this new video, SETI founder Frank Drake and astronomer Jill Tarter about why the search of the cosmos is important and needed. Visit SETI online to learn more about the search for signals of extraterrestrial life using radio telescopes on Earth and how you can help.