Psi Capricorni
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Capricornus |
| Right ascension | 20h 46m 05.73263s[1] |
| Declination | −25° 16′ 15.2312″[1] |
| Apparent magnitude (V) | 4.13[2] |
| Characteristics | |
| Spectral type | F5 V[3] |
| U−B color index | −0.03[2] |
| B−V color index | 0.42[2] |
| Astrometry | |
| Radial velocity (Rv) | +20.3[4] km/s |
| Proper motion (μ) | RA: −51.96[1] mas/yr Dec.: −156.56[1] mas/yr |
| Parallax (π) | 68.13 ± 0.27[1] mas |
| Distance | 47.9 ± 0.2 ly (14.68 ± 0.06 pc) |
| Details | |
| Surface gravity (log g) | 4.50[5] cgs |
| Temperature | 6,632[5] K |
| Metallicity [Fe/H] | −0.11[5] dex |
| Rotational velocity (v sin i) | 40.9 ± 2.0[6] km/s |
| Age | 1.4[3] Gyr |
| Other designations | |
Psi Capricorni (ψ Cap, ψ Capricorni) is a star in the constellation Capricornus. ψ Capricorni is a yellow-white F-type main sequence dwarf with an apparent magnitude of +4.13. It is approximately 47.9 light years from Earth. The measured rotational velocity of this star is approximately 41 km/s[6] (the Sun has an equatorial rotation velocity of 2 km/s). Analysis of the line profile of the star's spectrum indicates that it is undergoing differential rotation, with the variation by latitude being similar to the Sun.[8]
Chinese name
In Chinese, 天田 (Tiān Tián), meaning Celestial Farmland, refers to an asterism consisting of ψ Capricorni, ω Capricorni, 3 Piscis Austrini, and 24 Capricorni.[9] Consequently, ω Capricorni itself is known as 天田四 (Tiān Tián sì, English: the Fourth Star of Celestial Farmland.)[10]
In R. H. Allen's version, this star represented the state Yue.[11]
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 7 月 3 日
- ↑ Star Names - R.H.Allen p.142
