| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 23h33m 57.18791s[1] |
| Declination | 31° 19′ 31.0058″[1] |
| Apparent magnitude (V) | 4.97[2] |
| Characteristics | |
| Spectral type | K4IIIb[3] |
| U−B color index | +1.63[4] |
| B−V color index | +1.39[4] |
| Variable type | suspected[5] |
| Astrometry | |
| Radial velocity (Rv) | −24.71[6] km/s |
| Proper motion (μ) | RA: +50.81[1] mas/yr Dec.: −17.46[1] mas/yr |
| Parallax (π) | 5.94 ± 0.45 mas[1] |
| Distance | 550 ± 40 ly (170 ± 10 pc) |
| Absolute magnitude (MV) | −1.15[2] |
| Orbit[7] | |
| Period (P) | 492.30 ± 75.96 a (179,811 ± 27,745 d) |
| Semi-major axis (a) | 0.568 ± 0.065″ |
| Eccentricity (e) | 0.322 ± 0.047 |
| Inclination (i) | 21.7 ± 8.3° |
| Longitude of the node (Ω) | 56.2 ± 6.0° |
| Periastron epoch (T) | MJD 16818 ± 3658 |
| Argument of periastron (ω) (secondary) | 293 ± 15° |
| Details | |
| Mass | 2 / 2[7] M☉ |
| Luminosity | 554[2] L☉ |
| Surface gravity (log g) | 2.00[8] cgs |
| Temperature | 4,379[9] K |
| Metallicity [Fe/H] | +0.06[2] dex |
| Rotational velocity (v sin i) | 1.4[10] km/s |
| Other designations | |
72 Peg, NSV 14617, BD+30°4978, GC 32772, HD 221673, HIP 116310, HR 8943, SAO 73341, CCDM J23340+3120AB, WDS J23340+3120AB[11] | |
| Database references | |
| SIMBAD | data |
72 Pegasi is a binary star system in the northern constellationofPegasus. It is visible to the naked eye as a faint, orange-hued point of light with a combined apparent visual magnitude of 4.97.[2] The system is located approximately 550 light years away from the Sun, based on parallax,[1] but is drifting closer with a radial velocity of −25 km/s.[6]
This is a visual binary with an orbital period of roughly 492 years and an eccentricity of 0.32. The two stars are relatively similar and are about twice the mass of the Sun each. The primary star, 72 Pegasi A, is an evolved K-type giant with a visual magnitude of 5.67. The companion, 72 Pegasi B, is another K-type giant with an apparent magnitude of 6.11, and a separation of about 0.568″ from the primary. 72 Pegasi B is thought to be a binary itself, with a brown dwarf companion in a 4.2-year period.[7]
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