Beta Pavonis
Star in the constellation Pavo
From Wikipedia, the free encyclopedia
Beta Pavonis is a single,[9] white-hued star in the southern constellation of Pavo. Its name is a Bayer designation that is Latinized from β Pavonis, and abbreviated Beta Pav or β Pav. It can be seen with the naked eye, having an apparent visual magnitude of 3.42.[2] Based upon an annual parallax shift of 24.14 mas as seen from Earth, it is located 135 light-years from the Sun. It is moving away from the Sun with a radial velocity of +4 km/s.[6] Beta Pavonis is a member of the Ursa Major Moving Group, a set of stars that share a similar motion through space.[10]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pavo |
| Right ascension | 20h 44m 57.49399s[1] |
| Declination | −66° 12′ 11.5708″[1] |
| Apparent magnitude (V) | 3.42[2] |
| Characteristics | |
| Spectral type | A5 IV[3] or A7 III[4] |
| U−B color index | +0.12[5] |
| B−V color index | +0.16[5] |
| Astrometry | |
| Radial velocity (Rv) | +3.7±0.5[6] km/s |
| Proper motion (μ) | RA: −42.67[1] mas/yr Dec.: +9.94[1] mas/yr |
| Parallax (π) | 24.14±0.16 mas[1] |
| Distance | 135.1 ± 0.9 ly (41.4 ± 0.3 pc) |
| Absolute magnitude (MV) | +0.33[2] |
| Details | |
| Mass | 2.51[3] M☉ |
| Radius | 2.3[7] R☉ |
| Luminosity | 66[3] L☉ |
| Surface gravity (log g) | 3.84[8] cgs |
| Temperature | 8,184±278[8] K |
| Rotational velocity (v sin i) | 75[3] km/s |
| Age | 305[8] Myr |
| Other designations | |
| β Pav, CPD−66°3501, FK5 775, GC 28862, HD 197051, HIP 102395, HR 7913, SAO 254862 | |
| Database references | |
| SIMBAD | data |
Zorec and Royer (2012) list a stellar classification for this star of A5 IV,[3] indicating it is an evolving subgiant star that has consumed the hydrogen at its core and has begun to expand onto the red giant branch. However, Houk (1979) listed a more evolved class of A7 III,[4] suggesting it is already a giant star. It has about 2.3[7] times the Sun's radius and 2.51[3] times the mass of the Sun. At the estimated age of 305[8] million years, the star still has a relatively high rate of spin, having a projected rotational velocity of 75 km/s.[3] Beta Pavonis is radiating 66[3] times the Sun's luminosity from its photosphere at an effective temperature of about 8,184 K.[8]