12 Pegasi

12 Pegasi is a K-type supergiant star located 1,380 light years from Earth 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]

12 Pegasi

Location of 12 Pegasi (circled)
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Pegasus
Right ascension	21h 46m 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