Hydrus facts for kids

Kids Encyclopedia Facts
Hydrus
Constellation
Abbreviation Hyi
Genitive Hydri
Pronunciation /ˈhdrəs/, genitive /ˈhdr/
Symbolism the water snake
Right ascension 00h 06.1m to 04h 35.1m
Declination −57.85° to −82.06°
Quadrant SQ1
Area 243 sq. deg. (61st)
Main stars 3
Bayer/Flamsteed
stars
19
Stars with planets 4
Stars brighter than 3.00m 2
Stars within 10.00 pc (32.62 ly) 1
Brightest star β Hyi (2.82m)
Nearest star β Hyi
(24.38 ly, 7.47 pc)
Messier objects none
Meteor showers none
Bordering
constellations
Dorado
Eridanus
Horologium
Mensa
Octans
Phoenix (corner)
Reticulum
Tucana
Visible at latitudes between +8° and −90°.
Best visible at 21:00 (9 p.m.) during the month of November.

Hydrus is a small constellation in the deep southern sky. It was one of twelve constellations created by Petrus Plancius from the observations of Pieter Dirkszoon Keyser and Frederick de Houtman and it first appeared on a 35-cm (14 in) diameter celestial globe published in late 1597 (or early 1598) in Amsterdam by Plancius and Jodocus Hondius.

The first depiction of this constellation in a celestial atlas was in Johann Bayer's Uranometria of 1603. The French explorer and astronomer Nicolas Louis de Lacaille charted the brighter stars and gave their Bayer designations in 1756. Its name means "male water snake", as opposed to Hydra, a much larger constellation that represents a female water snake. It remains below the horizon for most Northern Hemisphere observers.

The brightest star is the 2.8-magnitude Beta Hydri, also the closest reasonably bright star to the south celestial pole. Pulsating between magnitude 3.26 and 3.33, Gamma Hydri is a variable red giant 60 times the diameter of our Sun. Lying near it is VW Hydri, one of the brightest dwarf novae in the heavens. Four star systems in Hydrus have been found to have exoplanets to date, including HD 10180, which could bear up to nine planetary companions.

Images for kids


Hydrus Facts for Kids. Kiddle Encyclopedia.