"Jabberwalker" said How large does a satellite have to be tho qualify as a "moon"?
There is not an established lower limit on what is considered a "moon". Every natural celestial body with an identified orbit around a planet of the Solar System, some as small as a kilometer across, has been identified as a moon.
How large does a satellite have to be tho qualify as a "moon"?
Not big at all.
1998QE2, which passed by not long ago, had a satellite 600 meters in diameter.
How large does a satellite have to be tho qualify as a "moon"?
There is not an established lower limit on what is considered a "moon". Every natural celestial body with an identified orbit around a planet of the Solar System, some as small as a kilometer across, has been identified as a moon.