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List of stars in Grus
|Pronunciation||//, or colloquially //; genitive //|
|Right ascension||22 h|
|Area||366 sq. deg. (45th)|
|Stars with planets||5|
|Stars brighter than 3.00m||3|
|Stars within 10.00 pc (32.62 ly)||1|
|Brightest star||α Gru (Alnair) (1.73m)|
|Nearest star||Gliese 832
(16.11 ly, 4.94 pc)
The stars were first defined as a separate constellation by Petrus Plancius, who created twelve new constellations based on the observations of Pieter Dirkszoon Keyser and Frederick de Houtman. Grus first appeared on a 35-cm diameter celestial globe published in 1597 (or 1598) in Amsterdam by Plancius with Jodocus Hondius. Its first depiction in a celestial atlas was in Johann Bayer's Uranometria of 1603.
Notable features 
Grus has several bright stars. Alpha Gruis, called Alnair, is a blue-white star of magnitude 1.7, 101 light-years from Earth. Its traditional name, Alnair, means "the bright one" and refers to its status as the brightest star in Grus. Beta Gruis is a red giant variable star with a minimum magnitude of 2.3 and a maximum magnitude of 2.0; it is 170 light-years from Earth. Gamma Gruis is a blue giant of magnitude 3.0, 203 light-years from Earth.
There are several celebrated naked-eye double stars in Grus. Delta Gruis, composed of Delta1 Gruis and Delta2 Gruis, is an optical double. Delta1 is a yellow giant of magnitude 4.0, 296 light-years from Earth, and Delta2 is a red giant of magnitude 4.1, 325 light-years from Earth. Mu Gruis, composed of Mu1 Gruis and Mu2 Gruis, is also an optical double. Mu1 is the brighter of the two at magnitude 4.8 - it is 262 light-years from Earth - and Mu2 the dimmer at magnitude 5.is 240 light-years from Earth. Pi Gruis, an optical double with a variable component, is composed of Pi1 Gruis and Pi2. Pi1 is a semi-regular red giant with a minimum magnitude of 6.7 and a maximum magnitude of 5.4. It has a period of 150 days and is 500 light-years from Earth. Pi2 is a white giant 132 light-years from Earth and is often brighter than its companion at magnitude 5.6.
The stars that correspond to Grus cannot all be seen from China. In Chinese astronomy some of them are located in the Black Tortoise of the North (北方玄武, Běi Fāng Xuán Wǔ), while the rest were placed among the Southern Asterisms (近南極星區, Jìnnánjíxīngōu) by Xu Guangqi, based on knowledge of western star charts.
See also 
- Ridpath, Ian; Tirion, Wil (2001), Stars and Planets Guide, Princeton University Press, ISBN 0-691-08913-2
- Ian Ridpath and Wil Tirion (2007). Stars and Planets Guide, Collins, London. ISBN 978-0-00-725120-9. Princeton University Press, Princeton. ISBN 978-0-691-13556-4.
|Wikimedia Commons has media related to:|
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