32 Pegasi
Star in the constellation Pegasus
From Wikipedia, the free encyclopedia
32 Pegasi is a binary star[10] system in the northern constellation of Pegasus. It is visible to the naked eye as a faint, blue-white hued point of light with an apparent visual magnitude of 4.81[2] The system is located approximately 560 light years away from the Sun based on parallax, and is drifting further away with a radial velocity of +11.4 km/s.[5]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 22h 21m 19.33896s[1] |
| Declination | 28° 19′ 49.8786″[1] |
| Apparent magnitude (V) | 4.81[2] (4.83 + 8.86)[3] |
| Characteristics | |
| Spectral type | B9III[4] |
| U−B color index | −0.19[2] |
| B−V color index | +0.00[2] |
| Astrometry | |
| Radial velocity (Rv) | +11.40[5] km/s |
| Proper motion (μ) | RA: +17.426[1] mas/yr Dec.: +7.122[1] mas/yr |
| Parallax (π) | 5.7814±0.3196 mas[1] |
| Distance | 560 ± 30 ly (173 ± 10 pc) |
| Absolute magnitude (MV) | −1.82[6] |
| Details | |
| 32 Peg Aa | |
| Luminosity | 541[6] L☉ |
| Temperature | 11,403[7] K |
| Rotational velocity (v sin i) | 60[8] km/s |
| Other designations | |
| 32 Peg, BD+27°4299, GC 31253, HD 212097, HIP 110371, HR 8522, SAO 90440, CCDM J22213+2820AF, WDS J22213+2820Aa,Ab[9] | |
| Database references | |
| SIMBAD | data |
The brighter member of this system, designated component Aa, has visual magnitude 4.83 with a stellar classification of B9III,[4] matching a late B-type star with the luminosity class of a giant. It is spinning with a projected rotational velocity of 60 km/s,[8] and is radiating 541[6] times the luminosity of the Sun from its photosphere at an effective temperature of 11,403 K.[7]
The fainter secondary, component Ab, is of magnitude 8.86 with an angular separation of 0.50″ along a position angle of 288° from the primary, as of 2005. Visual companions include component B, at a 70.7″ separation from the primary and magnitude 10.73; C, at a separation from B of 3.2″ and magnitude 12.4; as well as D (separation from A of 42.8″ and magnitude 11.9) and E (separation from A of 58.3" and magnitude 11.9).[3]