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An Opportunity From Above

To commemorate the 12th anniversary of NASA’s Mars Reconnaissance Orbiter at Mars (March 10, 2006) and the still-roving Opportunity, below is an edited version of an article I wrote back in 2011 showing Opportunity imaged by MRO’s HiRISE camera.

NASA’s Opportunity rover on the edge of Santa Maria crater imaged by HiRISE on March 1, 2011.

The eye in the sky sees all…especially when that eye is the HiRISE camera on the Mars Reconnaissance Orbiter! Here’s an image of a crater known as Santa Maria, taken from over 150 miles above the Martian surface by the MRO…and if you look carefully at the lower right portion of the crater rim you can see a small grey object that casts a bit of a shadow. That’s the rover Opportunity, which has been investigating the area around Santa Maria for the past several months and was using its robotic arm to take close-up shots of a small nearby rock when the image above was acquired.

I wonder if she got the feeling that she was being watched. 😉

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Dawn Sees Landslides and a Central Ridge in a Young Crater on Ceres

Enhanced-color view of Haulani Crater on Ceres. Credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

Enhanced-color view of Haulani Crater on Ceres. Credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

Ceres’ Haulani Crater, with a diameter of 21 miles (34 km), shows evidence of landslides from its crater rim. Smooth material and a central ridge stand out on its floor. This image was made using data from NASA’s Dawn spacecraft when it was in its high-altitude mapping orbit, at a distance of 915 miles (1,470 km) from Ceres.

This enhanced color view allows scientists to gain insight into materials and how they relate to surface morphology. Rays of bluish ejected material are prominent in this image, the color having been associated with young features.

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A Craterful of Cracks

The northwest quadrant of a frost-filled crater on Mars. Original image ESP_042895_2495; credit: NASA/JPL/University of Arizona.

The northwest quadrant of a frost-filled crater on Mars. Original image ESP_042895_2495; credit: NASA/JPL/University of Arizona.

Here’s a view of a section of a crater on Mars filled with a lacework of bright spidery fractures, acquired on Sept. 20, 2015 with the HiRISE camera aboard NASA’s Mars Reconnaissance Orbiter. The crater is approximately 3 miles (5 km) wide and located in Mars’ north polar region, and its old, infilled interior has undergone countless millennia of freeze/thaw cycles that have broken the surface into polygons of all sizes, outlined by frost-filled cracks.

The fractured segments get increasingly more compressed closer to the crater rim, which contains the outward freeze expansion.

According to the image description from the HiRISE team:
The crater rim constrains the polygon formation within the crater close to the rim, creating a spoke and ring pattern of cracks. This leads to more rectangular polygons than those near the center of the crater. The polygons close to the center of the crater display a more typical pattern. A closer look shows some of these central polygons, which have smaller polygons within them, and smaller polygons within those smaller polygons, which makes for a natural fractal! 

See a wider view of the imaged region here.

Source: HiRISE/University of Arizona

Icy Enceladus Shines in the Latest Images from Cassini

A view of the Saturn-lit night side of Enceladus from Oct. 14, 2015.

A view of the Saturn-lit night side of Enceladus from Oct. 14, 2015.

On Wednesday, Oct. 14 2015, Cassini performed its scheduled “E-20” close pass of Enceladus, a 320-mile-wide moon of Saturn that is now famous for the organics-laden ice geysers that fire from cracks in its southern crust. E-20 is the first of a series of three flybys to be performed before the end of 2015, specifically timed to give the spacecraft a good view of Enceladus’ north polar region now that Saturn is moving into its summer season.

The raw image data from E-20 has just arrived on Earth today (which, by the way, is the 18th anniversary of Cassini’s launch!) and I particularly liked the one above. Crescent-lit by the Sun, Enceladus’ night side is seen bathed in the dimmer glow of reflected light off Saturn and its rings. Dead-center is the 6.5-mile-wide crater Bahman, surrounded by a wrinkly field of cracks and troughs in the moon’s highly-reflective icy surface.

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Oh What a Relief! Cool 3D Views of the Moon via LROC

Red/cyan anaglyph of Hell Q crater on the Moon's near side  (NASA/GSFC/Arizona State University)

Red/blue anaglyph of Hell Q crater on the Moon’s near side (NASA/GSFC/Arizona State University)

Do you have any of those paper 3D viewers around? You know, with the red and blue lenses? If so, pop ’em on and check out the image above from NASA’s Lunar Reconnaissance Orbiter Camera (LROC) showing the crater “Hell Q,” located on the Moon’s southern near side near the brightly-rayed Tycho. You might think a crater was just carved into your screen!

The 3.75-km-wide Hell Q is one of a cluster of 19 craters located around the main 32.5-km Hell crater. (And no, it wasn’t named after a realm of the afterworld but rather for Hungarian astronomer Maximillian Hell.)

The image was acquired on April 11, 2014. You can see a larger 3D view of the region around Hell Q below.

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