Hya - Hydra the Water Snake



Legend for constellation star maps, IAU and Sky & Telescope magazine (Roger Sinnott & Rick Fienberg), cc-by

Intro and Visual description

Hydra the Water Snake is included in the ancient star catalogs of Eudoxos of Knidos, Aratos of Soli, and Ptolemy.  It is the largest and longest of the constellations, stretching from Cancer to Libra.

Its brightest star is Alphard, which has an orangish tint.  Several constellations and asterisms ride on its back; from head to tail they are Sextans the Sextant, Crater the Cup, Corvus the Crow, and Noctua the Owl.

Star Clusters

M48 (Galactic cluster), mag. 6.0.
M68 (Globular cluster), mag. 8.2.


M83 the Pinwheel Galaxy (Spiral galaxy), mag. 7.6.



Constellation Info

Abbr: Hya

Genitive: Hydrae

Size: 1 of 88

RA: 11 hours

Evening culmination (9 pm): April, May

Midnight Culmination: March

Decl: -15 degrees

Entirely visible from: between -83° and 55° latitude

Partially visible from: S of -83° latitude, and N of 55° latitude

Not visible at all from: nowhere


Bordering constellations:

Constellation - Names

Arabic: الحية

Chinese: 長蛇座

English: Water Snake

French: Hydre Femelle

German: (Nördliche) Wasser-schlange

Greek: Ύδρα

Hebrew: נחש מים

Italian: Idra femmina

Latin: Hydra

Russian: Гидра

Spanish: Hidra

Related Objects

Related Asterisms