| Constellation | |
List of stars in Hydrus |
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| Abbreviation | Hyi |
|---|---|
| Genitive | Hydri |
| Pronunciation | /ˈhaɪdrəs/, genitive /ˈhaɪdraɪ/ |
| Symbolism | the water snake |
| Right ascension | 0.08 h ~ 4.66 h |
| Declination | −58° ~ −82° |
| 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. |
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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.
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Hydrus 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 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.[1]
The only star in Hydrus that anyone seems to have named is γ Hyi, which in China is known as Foo Pih. The constellation contains IC 1717. 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.[2]
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