Alpha Pegasi
This article is about the star named Markab, for alternate meanings, see Markab.
Alpha Pegasi
Pegasus constellation map.svg
The position of Alpha Pegasi in the Pegasus constellation.
Observation data
Epoch J2000      Equinox J2000
Constellation Pegasus
Right ascension 23h 04m 45.65s [1]
Declination +15° 12′ 19.0″ [1]
Apparent magnitude (V) 2.49
Characteristics
Spectral type B9 III
U−B color index -0.05
B−V color index -0.04
Variable type ?
Astrometry
Radial velocity (Rv) -4 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[1] mas
Distance 133 ± 1 ly
(40.9 ± 0.3 pc)
Absolute magnitude (MV) -0.70
Details
Mass 4 M
Radius 2.8 R
Luminosity 160 L
Temperature 11,000 K
Rotation 1.5 days
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 probably expand into a red giant. Like the Sun, it is expected to 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.

References

  1. ^ a b c d e van Leeuwen, F. (2007). "HIP 113963". Hipparcos, the New Reduction. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=113580. Retrieved 2010-12-22. 

External links


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