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From the Moon, Earth would appear 4 times larger than the Moon seen from Earth, and the magnitude of a "full earth" is around -17.

However, Jupiter from the Galilean moons appear much larger than the Earth from the Moon. What is the apparent magnitude and angular size of Jupiter from the Galilean moons and the closest / farthest moon?

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  • $\begingroup$ Jupiter from Io $\endgroup$
    – PM 2Ring
    Commented Sep 26, 2022 at 20:29
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    $\begingroup$ The angular size is obvious from the orbit distance and the diameter of Jupiter. The apparent magnitude is almost as easy: calculate solar irradiance at Jupiter's orbit, multiply by albedo of Jupiter, and Bob's your uncle. $\endgroup$
    – Carl Witthoft
    Commented Sep 27, 2022 at 11:14
  • $\begingroup$ I posted some tools you can use to answer this on your other question, astronomy.stackexchange.com/questions/50658/… $\endgroup$
    – giardia
    Commented Nov 30, 2022 at 9:34

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