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During a transit, Phobos can be seen from Mars as a large black disc rapidly moving across the face of the Sun. At the same time, the shadow of Phobos moves across the Martian surface. The event could also be regarded as a particularly quick and shallow annular solar eclipse by Phobos.
Annular eclipse of the Sun by Phobos (Curiosity, 20 August 2013) Eclipse of the Sun by Phobos, the larger of the two moons of Mars, in real time (Curiosity, 20 August 2013) The two moons of Mars, Phobos and Deimos, are much smaller than Earth's Moon, greatly reducing the frequency of solar eclipses on that planet.
Observers on Mars can view transits of Phobos and transits of Deimos across the Sun. The transits of Phobos could also be called partial eclipses of the Sun by Phobos, since the angular diameter of Phobos is up to half the angular diameter of the Sun. However, in the case of Deimos the term "transit" is appropriate, since it appears as a small ...
Phobos is named after the Greek god of fear and panic, who is the son of Ares (Mars) and twin brother of Deimos. Phobos is a small, irregularly shaped object with a mean radius of 11 km (7 mi). It orbits 6,000 km (3,700 mi) from the Martian surface, closer to its primary body than any other known natural satellite to a planet.
Many photos of Monday's solar eclipse managed to catch bright spots along the Sun's corona. An astronomer explains what people were seeing.
During the 2024 eclipse, the sun will be near “solar maximum.” This is the most active phase of a roughly 11-year solar cycle, which might lead to more prominent and evident sun activity ...
The Sun's angular diameter as seen from Mars, by contrast, is about 21'. Thus there are no total solar eclipses on Mars as the moons are far too small to completely cover the Sun. On the other hand, total lunar eclipses of Phobos happen almost every night. [26] The motions of Phobos and Deimos would appear very different from that of Earth's Moon.
Opportunity observed the eclipse, or transits of Phobos and transits of Deimos across the Sun, [31] and photographed the Earth, which appeared as a bright celestial object in the Martian sky. A transit of Mercury from Mars took place on January 12, 2005 from about 14:45 UTC to 23:05 UTC, but camera resolution did not permit seeing Mercury's 6.1 ...