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This article is about the star named Markab, for alternate meanings, see Markab.
Location of Alpha Pegasi
Alpha Pegasi
Observation data
Epoch J2000      Equinox J2000
Constellation Pegasus
Right ascension 23h 04m 45.7s
Declination +15° 12′ 18.9″
Apparent magnitude (V) 2.49
Spectral type B9 III
U-B color index -0.05
B-V color index -0.04
Variable type ?
Radial velocity (Rv) -4 km/s
Proper motion (μ) RA: 61.1 mas/yr
Dec.: -42.56 mas/yr
Parallax (π) 23.36 ± 0.76 mas
Distance 140 ± 5 ly
(43 ± 1 pc)
Absolute magnitude (MV) -0.70
Mass 4 M
Radius 2.8 R
Luminosity 160 L
Temperature 11,000 K
Metallicity ?
Rotation 1.5 days
Age ? years
Other designations
Markab, Marchab, 54 Pegasi, HR 8781, BD +14°4926, HD 218045, SAO 108378, FK5 871, HIP 113963.

Alpha Pegasi (α Peg / α Pegasi) is the third brightest star in the constellation Pegasus (despite its "alpha" designation) and one of the four stars in the asterism known as the Great Square of Pegasus. It has the traditional name Markab (or Marchab).

Markab is a relatively average star nearing the end of its stellar evolution on the main sequence. Markab will soon enter the helium burning phase of its development, during which it will likely expand into a red giant. Like the Sun, it will probably end its life quietly as a white dwarf.

The name Markab comes from an Arabic word مركب markab, "the saddle of the horse", or is mistranscription of Mankib comes from an Arabic phrase منكب الفرس Mankib al-Faras, "(the Star of) the Shoulder (of the Constellation) of the Horse" for β Pegasi.

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