Hydra (constellation) facts for kids

Kids Encyclopedia Facts
Abbreviation Hya
Genitive Hydrae
Symbolism the sea serpent
Right ascension 8–15
Declination −20
Quadrant SQ2
Area 1303 sq. deg. (1st)
Main stars 17
Stars with planets 16
Stars brighter than 3.00m 2
Stars within 10.00 pc (32.62 ly) 4
Brightest star Alphard (α Hya) (1.98m)
Nearest star LHS 3003
(20.67 ly, 6.34 pc)
Messier objects 3
Meteor showers
  • Alpha Hydrids
  • Sigma Hydrids
Visible at latitudes between +54° and −83°.
Best visible at 21:00 (9 p.m.) during the month of April.
Hydra IAU
Map of the constellation

Hydra is a constellation that has parts in the northern sky and parts in the southern sky. It is the biggest constellation. It represents a water snake. The astronomer named Ptolemy listed Hydra when he made a list of 48 constellations. It is also one of the 88 modern constellations that were made by the International Astronomical Union.

Even though Hydra is a very big constellation, it only has one bright star. This star is named Alphard. Alphard means "the solitary one" in Arabic.

Images for kids

Hydra (constellation) Facts for Kids. Kiddle Encyclopedia.