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Hydra (Sea Serpent)

Month Best Visible


Hemisphere Visible

Northern and Southern

Despite its size, Hydra contains only one reasonably bright star, Alphard which is a double star. R Hydrae is a Mira variable star that can be seen in the constellation of Hydra.

The shape of Hydra shows a twisting snake, which relates to the story of Apollo and is the sanke the crow fetches with Apollo angrily casting them both into the sky.

Neighbouring Constellations

Leo (Lion)

Puppis (Stern)

Libra (Balance)

Virgo (Virgin)

Lupus (Wolf)

Monoceros (Unicorn)

Pyxis (Compass)

Antlia (Air Pump)

Cancer (Crab)

Canis Minor (Little Dog)

Centaurus (Centaur)

Corvus (Crow)

Crater (Cup)

Picture of Hydra