In which constellation is R Aquarii located: Andromeda, Apus, Antlia or Aquarius?

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R Aquarii, also designated R Aqr, is a variable star located in the constellation Aquarius.

Learn more on Codexery: R Aquarii in Variable Stars

How many moons does Mars have?

Which planet is known as the Red Planet?

In which constellation is Robert's Quartet located: Phoenix, Draco, Grus or Corona Borealis?

In what year was NGC 7213 discovered: 1786, 1834, 1836 or 1864?

In what year was Messier 58 discovered: 1764, 1773, 1779 or 1781?

In which constellation is NGC 5679 Group located: Corona Borealis, Phoenix, Virgo or Leo?