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[[ |250px]]List of stars in Hydrus | |
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Hydrus (
/ˈhaɪdrəs/) is a small constellation in the southern sky, created in the sixteenth century. Its name means "male water snake", and it should not be confused with Hydra, a much larger constellation which represents a female water snake.
History[]
Hydrus was one of twelve constellations created by Petrus Plancius from the observations of Pieter Dirkszoon Keyser and Frederick de Houtman[1] and it first appeared on a 35-cm diameter celestial globe published in 1597 (or 1598) in Amsterdam by Plancius with Jodocus Hondius. The first depiction of this constellation in a celestial atlas was in Johann Bayer's Uranometria of 1603.[2][3] The companion to Hydra, the female water snake, he is forced to journey through Eridanus, Orion, and the Milky Way to visit his lover.[3]
Notable features[]
Stars[]
Hydra does not contain any particularly bright stars. Beta Hydri, the brightest star in Hydrus, is a yellow star of magnitude 2.8, 24 light-years from Earth. Alpha Hydri is a white main-sequence star of magnitude 2.9, 71 light-years from Earth. Gamma Hydri is a red giant of magnitude 3.2, 214 light-years from Earth.[1]
There is one notable double star in Hydrus. Pi Hydri, composed of Pi1 Hydri and Pi2 Hydri, is divisible in binoculars. Pi1 is a red star of magnitude 5.6, 740 light-years from Earth. Pi2 is an orange star of magnitude 5.7, 468 light-years from Earth.[1]
The only star in Hydrus that anyone seems to have named is γ Hyi, which in China is known as Foo Pih.
Deep-sky objects[]
The constellation contains IC 1717.
Extrasolar planets[]
In August 2010, a European astronomical team working at the La Silla Observatory in Chile announced that they had confirmed the presence of at least five planets orbiting the star HD 10180 in Hydrus.[4]
See also[]
- USS Hydrus (AKA-28)
References[]
- Citations
- ↑ 1.0 1.1 1.2 Ridpath & Tirion 2001, pp. 160-161.
- ↑ "Hydrus (Water Snake)". Chandra X-ray Observatory. http://chandra.harvard.edu/photo/constellations/hydrus.html. Retrieved 10 July 2012.
- ↑ 3.0 3.1 Staal 1988, p. 243.
- ↑ "New solar system has up to seven planets". news.com.au. 25 August 2010. http://www.news.com.au/technology/new-solar-system-has-up-to-seven-planets/story-e6frfro0-1225909749543.
- References
- Ridpath, Ian; Tirion, Wil (2001), Stars and Planets Guide, Princeton University Press, ISBN 0-691-08913-2
- Ridpath, Ian; Tirion, Wil (2007), Stars and Planets Guide, Princeton University Press, ISBN 978-0-691-13556-4
- Staal, Julius D.W. (1988), The New Patterns in the Sky, McDonald and Woodward Publishing Company, ISBN 0-939923-04-1
External links[]
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Wikimedia Commons has media related to: Hydrus |
- Chandra information about Hydrus
- The Deep Photographic Guide to the Constellations: Hydrus
- Star Tales – Hydrus
Template:Stars of Hydrus
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Coordinates: 
02h 00m 00s, −70° 00′ 00″
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