Upsilon Piscis Austrini
Star in the constellation Piscis Austrinus
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Upsilon Piscis Austrini (υ Piscis Austrini) is a solitary,[11] orange-hued star in the southern constellation of Piscis Austrinus. It is faintly visible to the naked eye with an apparent visual magnitude of +4.98.[2] Based upon an annual parallax shift of 7.69 mas as seen from the Earth,[1] the star is located 420 light-years from the Sun.
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Piscis Austrinus |
| Right ascension | 22h 08m 25.93132s[1] |
| Declination | −34° 02′ 37.8248″[1] |
| Apparent magnitude (V) | +4.98[2] |
| Characteristics | |
| Spectral type | K4 III[3] |
| B−V color index | +1.50[2] |
| Astrometry | |
| Radial velocity (Rv) | +20.1[4] km/s |
| Proper motion (μ) | RA: +4.55[1] mas/yr Dec.: −49.02[1] mas/yr |
| Parallax (π) | 7.69±0.22 mas[1] |
| Distance | 420 ± 10 ly (130 ± 4 pc) |
| Absolute magnitude (MV) | −0.47±0.062[5] |
| Details | |
| Mass | 3.5[6] M☉ |
| Radius | 39[7] R☉ |
| Luminosity | 387[7] L☉ |
| Surface gravity (log g) | 1.84[6] cgs |
| Temperature | 4,066[8] K |
| Metallicity [Fe/H] | +0.06[6] dex |
| Rotational velocity (v sin i) | 1.0±1.0[9] km/s |
| Age | 301[6] Myr |
| Other designations | |
| υ PsA, CPD−34°9054, HD 210066, HIP 109289, HR 8433, SAO 213577[10] | |
| Database references | |
| SIMBAD | data |
This is an evolved K-type giant star with a stellar classification of K4 III.[3] It is catalogued as a member of the Wolf 630 moving group.[12] Upsilon Piscis Austrini is moving through the galaxy at a speed of 36.4 km/s relative to the Sun. Its projected galactic orbit carries it between 17,700 and 25,400 light-years from the center of the galaxy.[13][unreliable source?]