Rho Pegasi
Star in the constellation Pegasus
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Rho Pegasi, Latinized from ρ Pegasi, is a star in the northern constellation of Pegasus, near the southern constellation boundary with Pisces. This is a probable astrometric binary system, as determined by changes to the proper motion of the visible component.[10] It has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.90.[2] The system is located at a distance of approximately 274 light years from the Sun based on parallax,[1] but it is drifting closer with a radial velocity of −10.6 km/s.[4]
 | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 22h 55m 13.66706s[1] |
| Declination | +08° 48′ 58.2387″[1] |
| Apparent magnitude (V) | 4.90[2] |
| Characteristics | |
| Spectral type | A1V[3] |
| U−B color index | +0.00[2] |
| B−V color index | +0.00[2] |
| Astrometry | |
| Radial velocity (Rv) | −10.6±0.9[4] km/s |
| Proper motion (μ) | RA: +80.370[1] mas/yr Dec.: +13.282[1] mas/yr |
| Parallax (π) | 11.9131±0.2232 mas[1] |
| Distance | 274 ± 5 ly (84 ± 2 pc) |
| Absolute magnitude (MV) | +0.01[5] |
| Details | |
| Mass | 2.84[6] M☉ |
| Radius | 3.1[7] R☉ |
| Luminosity | 110[6] L☉ |
| Surface gravity (log g) | 3.90[8] cgs |
| Temperature | 9,484[6] K |
| Rotational velocity (v sin i) | 107[6] km/s |
| Age | 331[8] Myr |
| Other designations | |
| ρ Peg, 50 Peg, BD+08°4961, GC 31963, HD 216735, HIP 113186, HR 8717, SAO 127839[9] | |
| Database references | |
| SIMBAD | data |
This visible component is an A-type main-sequence star with a stellar classification of A1V.[3] The star is 331[8] million years old and is spinning with a projected rotational velocity of 107 km/s.[6] It has 2.8[6] times the mass of the Sun and 3.1[7] times the Sun's radius. The star is radiating 110[6] times the luminosity of the Sun from its photosphere at an effective temperature of 9,484 K.[6]