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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 21h29m 56.89545s[1] |
| Declination | 23° 38′ 19.8170″[1] |
| Apparent magnitude (V) | 4.52[2] |
| Characteristics | |
| Evolutionary stage | AGB[3] |
| Spectral type | M1+III[4] |
| U−B color index | +1.93[5] |
| B−V color index | +1.62[5] |
| Astrometry | |
| Radial velocity (Rv) | −18.92[6] km/s |
| Proper motion (μ) | RA: +24.74[1] mas/yr Dec.: +3.63[1] mas/yr |
| Parallax (π) | 8.28 ± 0.18 mas[1] |
| Distance | 394 ± 9 ly (121 ± 3 pc) |
| Absolute magnitude (MV) | −0.89[2] |
| Details | |
| Radius | 55[7] R☉ |
| Luminosity | 653[7] L☉ |
| Temperature | 3,919[7] K |
| Other designations | |
2 Peg, NSV 25624, BD+23°4325, FK5 1565, GC 30109, HD 204724, HIP 106140, HR 8225, SAO 89752, CCDM J21299+2338A, WDS J21299+2338A[8] | |
| Database references | |
| SIMBAD | data |
2 Pegasi is a single[9] star in the constellation Pegasus, located approximately 394 light years away from the Sun based on parallax.[1] It is visible to the naked eye as a faint, red-hued star with an apparent visual magnitude of 4.52.[2] The object is moving closer to the Earth with a heliocentric radial velocity of −19 km/s.[6] It has a magnitude 12.7 visual companion, designated component B, at an angular separationof30.4″.[10]
This is an aging red giant star with a stellar classification of M1+III,[4] currently on the asymptotic giant branch,[3] having exhausted the hydrogen at its core and evolved away from the main sequence. The star has expanded to an estimated 55 times the radius of the Sun.[7] It is radiating 653 times the luminosity of the Sun from its enlarged photosphere at an effective temperatureof3,919 K.[7]
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