Pi Capricorni
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Capricornus |
| Right ascension | 20h27m19.2s |
| Declination | −18°12′42″ |
| Apparent magnitude (V) | +5.08 |
| Distance | 670 ± 110 ly (204 ± 33 pc) |
| Spectral type | B8II-III |
| Other designations | |
Pi Capricorni (π Cap, π Capricorni) is a double star in the constellation Capricornus. It also has the traditional star name Okul or Oculus (meaning eye in Latin).[1] It is approximately 670 light years from Earth.
In Chinese, 牛宿 (Niú Su), meaning Ox (asterism), refers to an asterism consisting of π Capricorni, β Capricorni, α2 Capricorni, ξ2 Capricorni, ο Capricorni and ρ Capricorni.[2] Consequently, π Capricorni itself is known as 牛宿四 (Niú Su sì, English: the Fourth Star of Ox.)[3]
The primary component, π Capricorni A, is a blue-white B-type bright giant with an apparent magnitude of +5.08. It is a spectroscopic binary whose two components are separated by 0.1 arcseconds. The third component, π Capricorni B, is an eighth magnitude star 3.4 arcseconds from the primary.[4]
References
- ↑ "Oculus".
- ↑ (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 13 日
- ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.