In which constellation is HK Aquarii located: Aquarius, Aries, Ophiuchus or Andromeda?

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HK Aquarii is a solitary variable star located in the equatorial constellation Aquarius.

Learn more on Codexery: HK 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 which constellation is R Aquarii located: Andromeda, Apus, Antlia or Aquarius?

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