I would venture to suggest that not many quizzers would have heard of this satellite, but most would opt for Uranus because it sounds like it could well be named after a Shakespeare character. (As every quizzer knows, the moons of Uranus are all named after Shakespeare characters – except for the two that are named after characters in Pope's The Rape of the Lock, one of whom happens to share his name with a Shakespeare character).
Margaret was named after one of Hero's two servants in Shakespeare's Much Ado About Nothing.
At the time of writing, Uranus has 27 known satellites. The last five were discovered in 2003, and Margaret is one of those five.
Margaret is classified as Uranus XXIII, as it was the 23rd of the 27 to be discovered (not counting Perdita – see below). With a diameter of only 20 kilometres, it's the third smallest; in order of average orbital radius it's number 24 (furthest but three).
Perdita was photographed in 1986 by the Voyager 2 spacecraft (along with nine other inner satellites of Uranus), but not noticed until 1999. It was demoted in 2001 because it hadn't been observed since 1986, and reinstated in 2003 after being photographed by the Hubble Space Telescope. It's classified as Uranus XXV.
Perdita is one of the heroines of Shakespeare's The Winter's Tale.
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