Alpha Pegasi
Star in the constellation Pegasus / From Wikipedia, the free encyclopedia
For other uses of "Markab", see Markab (disambiguation).
Alpha Pegasi (α Pegasi, abbreviated Alpha Peg, α Peg), formally named Markab /ˈmɑːrkæb/,[11][12] 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.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
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 | |
Spectral type | A0 IV[3] |
U−B color index | –0.06[2] |
B−V color index | –0.04[2] |
Variable type | suspected[4] |
Astrometry | |
Radial velocity (Rv) | –2.2[5] 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] |
Distance | 133 ± 1 ly (40.9 ± 0.3 pc) |
Absolute magnitude (MV) | –0.718[6] |
Details | |
Mass | 3.5[7] M☉ |
Radius | 4.62±0.29[8] R☉ |
Luminosity | 165[9] L☉ |
Surface gravity (log g) | 3.98±0.25[8] cgs |
Temperature | 10,100±100[8] K |
Metallicity [Fe/H] | −0.28[10] dex |
Rotational velocity (v sin i) | 130[8] km/s |
Age | 200[7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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