Psi Capricorni
Star in the constellation Capricornus
From Wikipedia, the free encyclopedia
Psi Capricorni is a single,[10] yellow-white hued star in the southern zodiac constellation of Capricornus. Its name is a Bayer designation that is Latinized from Ï Capricorni, and abbreviated Psi Cap or Ï Cap. This star is faintly visible to the naked eye with an apparent visual magnitude of +4.13.[2] The distance to this star is approximately 47.7 light-years (14.6 pc) based on parallax measurements,[1] and it is drifting further away with a radial velocity of +20 km/s.[4] The closest approach to the Sun occurred some 467,000 years ago at a separation of 20 light-years.[11]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Capricornus |
| Right ascension | 20h 46m 05.733s[1] |
| Declination | â25° 16â² 15.23â³[1] |
| Apparent magnitude (V) | 4.13[2] |
| Characteristics | |
| Evolutionary stage | main sequence[1] |
| Spectral type | F5 V[3] |
| UâB color index | â0.03[2] |
| BâV color index | +0.42[2] |
| Astrometry | |
| Radial velocity (Rv) | +20.3[4] km/s |
| Proper motion (μ) | RA: â52.557 mas/yr[1] Dec.: â156.935 mas/yr[1] |
| Parallax (Ï) | 68.3370±0.1823 mas[1] |
| Distance | 47.7 ± 0.1 ly (14.63 ± 0.04 pc) |
| Absolute magnitude (MV) | 3.33[5] |
| Details | |
| Mass | 1.35+0.12 â0.07[6] Mâ |
| Radius | 1.49±0.03[6] Râ |
| Luminosity | 3.77+0.18 â0.20[6] Lâ |
| Surface gravity (log g) | 4.25[7] cgs |
| Temperature | 6,589+56 â50[6] K |
| Metallicity [Fe/H] | 0.15[7] dex |
| Rotational velocity (v sin i) | 40.9±2.0[8] km/s |
| Age | 2.34+0.36 â0.97[6] Gyr |
| Other designations | |
| Ï Cap, 16 Capricorni, CDâ25°15018, FK5 779, GC 28929, GJ 805, HD 197692, HIP 102485, HR 7936, SAO 189664, PLX 4947.00[9] | |
| Database references | |
| SIMBAD | data |
This object is an F-type main-sequence star with a stellar classification of F5 V.[3] It is 2.3 billion years old with 1.35 times the mass of the Sun.[6] The measured rotational velocity of this star is approximately 41 km/s[8] (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.[12] The star has 1.49 times the Sun's radius and is radiating 3.77 times the luminosity of the Sun from its photosphere at an effective temperature of 6,589 K.[6] It displays an infrared excess, suggesting the presence of an orbiting debris disk at a separation of 38.75 AU and a temperature of 60 K.[13]
Chinese name
In Chinese, å¤©ç° (TiÄn Tián), meaning Celestial Farmland, refers to an asterism consisting of Ï Capricorni, Ï Capricorni, 3 Piscis Austrini, and 24 Capricorni.[14] Consequently, the Chinese name for Ï Capricorni itself is 天ç°å (TiÄn Tián sì, English: the Fourth Star of Celestial Farmland).[15]
In R. H. Allen's version, this star represented the battle-axe Yue.[16]