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Headshot of Emily Lakdawalla

Light plays on a Martian crater rim

Posted By Emily Lakdawalla

16-02-2016 13:30 CST

Topics: pretty pictures, amateur image processing, Mars, Curiosity (Mars Science Laboratory)

Recently, space image processing enthusiast Thomas Appéré noticed that Curiosity had taken five photos of exactly the same spot on the rim of Gale crater, identical but for being taken at different times of day. That spot was due north of the rover, so the rising and lowering Sun illuminates the rounded hummocks of the crater rim differently from early morning to early afternoon. It's winter in the Martian southern hemisphere, so the Sun is north of the rover, slightly shadowing rover-facing slopes. Here, Appéré has stacked the five images and animated them:

A day on the wall of Gale crater, Mars

NASA / JPL / MSSS / Thomas Appéré

A day on the wall of Gale crater, Mars
While working at Namib dune, Curiosity took advantage of relatively clear skies to shoot several images at the same spot on the rim of Gale crater, due north of the rover. Three of the photos were taken on sol 1246 (February 7, 2016), and two were taken on sols 1234 and 1235.

The animated GIF format posterizes the color, so to help you better appreciate the shifting shadows I made a "before-and-after" comparison of two of them. Appéré posted these and one more of the images in full resolution and color on his Flickr page.

Before & after: Changing lighting conditions on Gale crater's rim
Before & after: Changing lighting conditions on Gale crater's rim
 

NASA / JPL / MSSS / Thomas Appéré

Before & after: Changing lighting conditions on Gale crater's rim
While working at Namib dune, Curiosity took advantage of relatively clear skies to shoot several images at the same spot on the rim of Gale crater, due north of the rover. These two photos were taken on sols 1234, with light from the and 1235 (January 25 and 26, 2016). At 7:00 a.m. local time, the light is from the east (right); at 12:31 p.m. local time, the light is high and to the west (left). It is also winter at the rover's position just south of the equator, so the near-noon light throws some shadow toward the rover.

They're pretty enough to be a painting!

 
See other posts from February 2016

 

Read more blog entries about: pretty pictures, amateur image processing, Mars, Curiosity (Mars Science Laboratory)

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