Image:15-ml-06-phobos2-A067R1.jpg

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Credit: NASA/JPL/Cornell [4]

A transit of Phobos from Mars: Phobos is in transit across the Sun, as seen from Mars by Mars Rover Opportunity on March 10, 2004 at 07:36:38 UTC Earth time.

In the photo, the Sun has angular diameter 20.5' while Phobos has angular diameter of 15.1'. Deimos by contrast usually has an angular diameter of about 2.3' as seen from Mars. Phobos took about 32 seconds to transit the Sun.

http://marsrovers.jpl.nasa.gov/gallery/press/opportunity/20040311a.html

Original filename: http://marsrovers.jpl.nasa.gov/gallery/all/1/p/045/1P132176262ESF05A6P2670R8M1.JPG [5]

The timestamp built into the filename is 132176262 seconds since January 1, 2000 11:58:55.816 UTC ([6]), or March 10, 2004 07:36:37.816 UTC (the three-decimal-digit precision is of course not real).

• Opportunity image gallery: Sol 45 (small images of the March 10, 2004 transit are near the middle of the page).