Phi Orionis

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φ¹ Orionis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Orion
Right ascension 5h 34m 49.2s
Declination 9° 29' 22"
Apparent magnitude (V) +4.39
Absolute magnitude (V) -3.04
Distance 1000 ly
(306.75 pc)
Spectral type B0V
Other designations
37 Orionis HR 1876,
HD 36822, FK5 208, SAO 112914,
HIP 26176, BD +09 877, TD1 4886

The Bayer designation Phi Orionis (φ Ori, φ Orionis) is shared by two star systems, φ¹ Orionis and φ² Orionis, in the constellation Orion. The two stars are separated by approximately 0.71° in the sky.

φ¹ Orionis[edit]

Phi-1 Orionis, is a binary star lying about 1000 light years from Earth. Phi-1 Orionis is a spectral type B0 main sequence star which has an apparent magnitude of +4.39.

φ² Orionis[edit]

φ² Orionis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Orion
Right ascension 5h 36m 54.3s
Declination 9° 17' 26"
Apparent magnitude (V) +4.09
Absolute magnitude (V) +1.32
Distance 117 ly
(35.89 pc)
Spectral type K0III
Other designations
40 Orionis, HR 1907,
HD 36822, SAO 112958,
HIP 26366, BD +09 898

Phi-2 Orionis, is a spectral type K0 giant which has an apparent magnitude of +4.09. It is about 115 light years from Earth.

Etymology[edit]

Both of φ Ori and λ Ori were Al Haḳʽah, "a White Spot".[1]

The similar composition were found in Chinese astronomy, known as 觜宿 (Zī Sù), meaning Turtle Beak (asterism),[2] Consequently, both of φ Ori themselves is known as 觜宿二 (Zī Sù èr English: the Second Star of Turtle Beak.) (for φ1Ori) and 觜宿三 (Zī Sù sān English: the Third Star of Turtle Beak.) (for φ2Ori) [3]

References[edit]


  1. ^ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York, NY: Dover Publications Inc. p. 318. ISBN 0-486-21079-0. Retrieved 2011-07-16. 
  2. ^ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  3. ^ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 24 日

External links[edit]