Gamma Pegasi information

Gamma Pegasi
	Location of γ Pegasi (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Pegasus
Right ascension	00h 13m 14.15123s
Declination	+15° 11′ 00.9368″
Apparent magnitude (V)	+2.78 to 2.89
Characteristics
Spectral type	B2 IV
U−B color index	−0.85
B−V color index	−0.23
Variable type	β Cep
Astrometry
Radial velocity (Rv)	+4.1 km/s
Proper motion (μ)	RA: +1.98 mas/yr ; Dec.: –9.28 mas/yr
Parallax (π)	6.9474 ± 0.4293 mas
Distance	470 ± 30 ly ; (144 ± 9 pc)
Absolute magnitude (MV)	−2.64
Details
Mass	8.9±0.1 M☉
Radius	4.80±0.39 R☉
Luminosity	5,840 L☉
Surface gravity (log g)	3.98±0.06 cgs
Temperature	21,179±237 K
Metallicity [Fe/H]	−0.34 dex
Rotational velocity (v sin i)	0 km/s
Age	18.7±3.2 Myr
Other designations
	Algenib, gam Peg, 88 Peg, FK5 7, HD 886, HIP 1067, HR 39, SAO 91781
Database references
SIMBAD	data

Gamma Pegasi is a star in the constellation of Pegasus, located at the southeast corner of the asterism known as the Great Square. It has the formal name Algenib /ælˈdʒiːnɪb/;^[14]^[15] the Bayer designation Gamma Pegasi is Latinized from γ Pegasi and abbreviated Gamma Peg or γ Peg. The average apparent visual magnitude of +2.84^[4] makes this the fourth-brightest star in the constellation. The distance to this star has been measured using the parallax technique, yielding a value of roughly 470 light-years (144 parsecs).

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Observation data Epoch J2000 Equinox J2000
Location of γ Pegasi (circled)
Constellation	Pegasus
Right ascension	00^h 13^m 14.15123^s^[1]
Declination	+15° 11′ 00.9368″^[1]
Apparent magnitude (V)	+2.78 to 2.89^[2]
Characteristics
Spectral type	B2 IV^[3]
U−B color index	−0.85^[4]
B−V color index	−0.23^[4]
Variable type	β Cep^[5]
Astrometry

Radial velocity (R_v)	+4.1^[6] km/s
Proper motion (μ)	RA: +1.98 mas/yr^[1] Dec.: –9.28 mas/yr^[1]
Parallax (π)	6.9474 ± 0.4293 mas^[7]
Distance	470 ± 30 ly (144 ± 9 pc)
Absolute magnitude (M_V)	−2.64^[8]

Details

Mass	8.9±0.1^[3] `M`_☉
Radius	4.80±0.39^[9] `R`_☉
Luminosity	5,840^[10] `L`_☉
Surface gravity (log g)	3.98±0.06^[9] cgs
Temperature	21,179±237^[9] K
Metallicity [Fe/H]	−0.34^[11] dex
Rotational velocity (v sin i)	0^[12] km/s
Age	18.7±3.2^[3] Myr

Other designations
Algenib, gam Peg, 88 Peg, FK5 7, HD 886, HIP 1067, HR 39, SAO 91781^[13]
Database references
SIMBAD	data

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