Psi Capricorni

Psi Capricorni, Latinized from ψ Capricorni, is a single^[10] star in the southern zodiac constellation of Capricornus. It is a yellow-white hued star that is faintly visible to the naked eye with an apparent visual magnitude of +4.13.^[2] The distance to this star is approximately 47.9 light years 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]

Psi Capricorni

Location of ψ Capricorni (circled)
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 mas[1]
Distance	47.9 ± 0.2 ly (14.68 ± 0.06 pc)
Absolute magnitude (MV)	3.33[5]
Details
Mass	1.35+0.12 −0.07[6] M☉
Radius	1.49±0.03[6] R☉
Luminosity	3.77+0.18 −0.20[6] L☉
Surface gravity (log g)	4.25[7] cgs
Temperature	6,589+56 −50[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 −0.97[6] Gyr
Other designations
ψ Cap, 16 Capricorni, CD−25°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, 天田 (Tiān Tián), meaning Celestial Farmland, refers to an asterism consisting of ψ Capricorni, ω Capricorni, 3 Piscis Austrini, and 24 Capricorni.^[14] Consequently, the Chinese name for ω Capricorni itself is 天田四 (Tiān Tián sì, English: the Fourth Star of Celestial Farmland).^[15]

In R. H. Allen's version, this star represented the battle-axe Yue.^[16]