Curiosity Mars rover views eclipse of the Sun by Phobos

NASA Mars rover views eclipse of the Sun by Phobos

(Phys.org) —Images taken with a telephoto-lens camera on NASA's Mars rover Curiosity catch the larger of Mars' two moons, Phobos, passing directly in front of the sun—the sharpest images of a solar eclipse ever taken at Mars.

Phobos does not fully cover the sun, as seen from the surface of Mars, so the is what's called a ring, or annular, type.


"This event occurred near noon at Curiosity's location, which put Phobos at its closest point to the rover, appearing larger against the sun than it would at other times of day," said Mark Lemmon of Texas A&M University, College Station, a co-investigator for use of Curiosity's Mastcam. "This is the closest to a total eclipse of the sun that you can have from Mars."

Observations of the Martian moons, Phobos and Deimos, by Curiosity and by the older, still-active Mars rover Opportunity are helping researchers get more precise knowledge of the moons' orbits. During the Aug. 17 observation, the position of Phobos crossing the sun was a mile or two (two or three kilometers) closer to the center of the sun's position than researchers anticipated.

Lemmon said, "This one is by far the most detailed image of any Martian lunar transit ever taken, and it is especially useful because it is annular. It was even closer to the sun's center than predicted, so we learned something."


Malin Space Science Systems, San Diego, built and operates the Mastcam instrument and two other instruments on Curiosity.

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Citation: Curiosity Mars rover views eclipse of the Sun by Phobos (2013, August 29) retrieved 25 August 2019 from https://phys.org/news/2013-08-curiosity-mars-rover-views-eclipse.html

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Aug 29, 2013
Is that an eclipse or a transit?
