Martian astronomy: Percy sees a 'Phobos eclipse' from Mars

Perseverance captured an image of Phobos crossing in front of the Sun, a rare event that allows for precise measurements of the moon's orbit. The rovers use the main Mastcam-Z camera to take the images, with solar filters to protect the instruments. Phobos, the smaller of Mars' two moons, orbits at just under 6,000 kilometers above the surface and takes about 7 hours and 39 minutes to complete its orbit. The transit is real-time, with Phobos crossing the Sun's disk in under a minute. The image provides data for refining the orbit of Phobos, which is crucial for future missions.

• "Phobos' irregular shape allows it to be classified as an annular eclipse, with the rovers using the solar disk as a reference for precise measurements."
• "The transit provides better accuracy than the biggest telescope on Earth, as the rover is much closer to the target."
• "The data from the transit helps in understanding the internal structure of Mars and its moon, as tides from Phobos affect the planet's orbit."

This event is significant for planetary science, as it offers a unique opportunity to study the dynamics of Mars' moons. The data collected from the transit will be used in future missions, such as the Mars Moons Explorer (MMX), which will approach Phobos in 2027 and return samples to Earth. The findings will help improve our understanding of the Martian system and support future exploration efforts.

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