12 Pegasi
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 21h 46m 04.364s |
| Declination | +22° 56′ 55.96″ |
| Apparent magnitude (V) | +5.266 |
| Characteristics | |
| Spectral type | K0IbHdel0.5 |
| U−B color index | +1.33 |
| B−V color index | +1.41 |
| Astrometry | |
| Proper motion (μ) | RA: 8.299 mas/yr Dec.: −2.478 mas/yr |
| Parallax (π) | 2.3673±0.1279 mas |
| Distance | 1,380 ± 70 ly (420 ± 20 pc) |
| Absolute magnitude (MV) | −4.03 |
| Details | |
| Mass | 6.3 M☉ |
| Radius | 81 R☉ |
| Luminosity | 1,722–1,820 L☉ |
| Surface gravity (log g) | 1.11 cgs |
| Temperature | 4,185 K |
| Metallicity [Fe/H] | +0.03 dex |
| Rotational velocity (v sin i) | 19.5 km/s |
| Age | 19.8 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, 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.