Alpha Pegasi

For other uses of "Markab", see Markab (disambiguation).
α Pegasi
Location of α Pegasi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Pegasus
Right ascension 23h 04m 45.65345s[1]
Declination +15° 12′ 18.9617″[1]
Apparent magnitude (V) 2.48[2]
Characteristics
Evolutionary stage Giant star or main sequence star
Spectral type B9V,[3] B9.5III,[4] B9III[5] A0 IV[6]
U−B color index –0.06[2]
B−V color index –0.04[2]
Variable type suspected[7]
Astrometry
Radial velocity (Rv)–2.2[8] km/s
Proper motion (μ) RA: 60.40 ± 0.17[1] mas/yr
Dec.: -41.30 ± 0.16[1] mas/yr
Parallax (π)24.46 ± 0.19 mas[1]
Distance133 ± 1 ly
(40.9 ± 0.3 pc)
Absolute magnitude (MV)–0.718[9]
Details
Mass3.5[10] M☉
Radius4.62±0.29[11] R☉
Luminosity165[12] L☉
Surface gravity (log g)3.98±0.25[11] cgs
Temperature10,100±100[11] K
Metallicity [Fe/H]−0.28[13] dex
Rotational velocity (v sin i)130[11] km/s
Age200[10] Myr
Other designations
Markab, Marchab, 54 Pegasi, HR 8781, BD+14°4926, HD 218045, SAO 108378, FK5 871, HIP 113963
Database references
SIMBADdata

Alpha Pegasi (α Pegasi, abbreviated Alpha Peg, α Peg), formally named Markab /ˈmɑːrkæb/,[14][15] is the third-brightest star in the constellation of Pegasus and one of the four stars in the asterism known as the Great Square of Pegasus.

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  15. ^ "IAU Catalog of Star Names". Retrieved 28 July 2016.