| |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 21h46m 04.364s[1] |
| Declination | +22° 56′ 55.96″[1] |
| Apparent magnitude (V) | +5.266[2] |
| Characteristics | |
| Spectral type | K0IbHdel0.5[3] |
| U−B color index | +1.33[4] |
| B−V color index | +1.41[4] |
| Astrometry | |
| Proper motion (μ) | RA: 8.299[1] mas/yr Dec.: −2.478[1] mas/yr |
| Parallax (π) | 2.3673 ± 0.1279 mas[1] |
| Distance | 1,380 ± 70 ly (420 ± 20 pc) |
| Absolute magnitude (MV) | −4.03[4] |
| Details | |
| Mass | 6.3[5] M☉ |
| Radius | 81[6] R☉ |
| Luminosity | 1,722–1,820[6] L☉ |
| Surface gravity (log g) | 1.11[7] cgs |
| Temperature | 4,185[6] K |
| Metallicity [Fe/H] | +0.03[7] dex |
| Rotational velocity (v sin i) | 19.5[8] km/s |
| Age | 19.8[5] Myr |
| Other designations | |
12 Peg, HR 8321, HD 207089, BD+22°4472, HIP 107472, SAO 89962 | |
| Database references | |
| SIMBAD | data |
12 Pegasi is a K-type supergiant star in the constellation of Pegasus. It has a spectral type of K0Ib Hdel0.5,[9] which indicates that it is a less luminous K-type supergiant with strong H-δ Balmer lines. The star has expanded to 81 times the radius of the Sun, and has an effective temperature of 4,185 K.[6]
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