12 Pegasi

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]
Distance1,380 ± 70 ly
(420 ± 20 pc)
Absolute magnitude (MV)−4.03[4]
Details
Mass6.3[5] M☉
Radius81[6] R☉
Luminosity1,722–1,820[6] L☉
Surface gravity (log g)1.11[7] cgs
Temperature4,185[6] K
Metallicity [Fe/H]+0.03[7] dex
Rotational velocity (v sin i)19.5[8] km/s
Age19.8[5] Myr
Other designations
12 Peg, HR 8321, HD 207089, BD+22°4472, HIP 107472, SAO 89962
Database references
SIMBADdata

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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