Psi Capricorni
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Capricornus |
| Right ascension | 20h 46m 05.73263s |
| Declination | −25° 16′ 15.2312″ |
| Apparent magnitude (V) | 4.13 |
| Characteristics | |
| Spectral type | F5 V |
| U−B color index | −0.03 |
| B−V color index | +0.42 |
| Astrometry | |
| Radial velocity (Rv) | +20.3 km/s |
| Proper motion (μ) | RA: −51.96 mas/yr Dec.: −156.56 mas/yr |
| Parallax (π) | 68.13±0.27 mas |
| Distance | 47.9 ± 0.2 ly (14.68 ± 0.06 pc) |
| Absolute magnitude (MV) | 3.33 |
| Details | |
| Mass | 1.35+0.07 −0.12 M☉ |
| Radius | 1.49±0.03 R☉ |
| Luminosity | 3.77+0.18 −0.20 L☉ |
| Surface gravity (log g) | 4.25 cgs |
| Temperature | 6,589+50 −56 K |
| Metallicity [Fe/H] | 0.15 dex |
| Rotational velocity (v sin i) | 40.9±2.0 km/s |
| Age | 2.34+0.97 −0.36 Gyr |
| Other designations | |
| ψ Cap, 16 Capricorni, CD−25°15018, FK5 779, GC 805, HD 197692, HIP 102485, HR 7936, SAO 189664 | |
| Database references | |
| SIMBAD | data |
Psi Capricorni, Latinized from ψ Capricorni, is a single 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. The distance to this star is approximately 47.9 light years based on parallax measurements, and it is drifting further away with a radial velocity of +20 km/s. The closest approach to the Sun occurred some 467,000 years ago at a separation of 20 light-years.
This object is an F-type main-sequence star with a stellar classification of F5 V. It is 2.3 billion years old with 1.35 times the mass of the Sun. The measured rotational velocity of this star is approximately 41 km/s (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. 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. 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.