Tuesday Telescope: A rare glimpse of one of the smallest known moons

I'll bet you don't spend a ton of time thinking about Deimos.

Apr 22, 2025 - 13:34

Tuesday Telescope: A rare glimpse of one of the smallest known moons

I'll bet you don't spend a ton of time thinking about Deimos, the smaller of the two Martian moons, which is named after the Ancient Greek god that personified dread.

And who could blame you? Of the two Martian moons, Phobos gets more attention, including as a possible waystation for human missions to Mars. Phobos is larger than Deimos, with a radius of 11 km, and closer to the Martian surface, a little more than 9,000 km away.

By contrast, Deimos is tiny, with a radius of 6 km, and quite a bit further out, more than 23,000 km from the surface. It is so small that, on the surface of Mars, Deimos would only appear about as bright in the night sky as Venus does from Earth.

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