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Hydra - the Sea Serpent
Mythology - This constellation is associated with the Lernean Hydra, slain by Heracles. As one head was removed, two took its place. He eventually cauterized each severed neck to keep the heads from regenerating, until he reached the final, immortal head. This was buried under a rock.
Stars - Epsilon hydrae is a triple star system, two components may be resolved in amateur telescopes .
Deepsky - The “Ghost of Jupiter” is an 8th magnitude planetary nebula low down in altitude and best seen with a telescope of aperture 6" or greater. More accessible is M48, a 6th magnitude open cluster which is easily visible in binoculars.
Visibility - Although the whole of Hydra is not visible from the UK, the best time to view it is April.