Phi 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 | |
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
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
| 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 | |
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
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
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- ↑ (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.
- ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 24 日
External links
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