Beta Pegasi
Red giant star in the constellation Pegasus / From Wikipedia, the free encyclopedia
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"Scheat" redirects here. For the star in Aquarius, see Delta Aquarii.
Beta Pegasi (β Pegasi, abbreviated Beta Peg, β Peg), formally named Scheat /ˈʃiːæt/,[11][12] is a red giant star and the second-brightest star (after Epsilon Pegasi) in the constellation of Pegasus. It forms the upper right corner of the Great Square of Pegasus,[13] a prominent rectangular asterism.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Pegasus |
Right ascension | 23h 03m 46.45746s[1] |
Declination | +28° 04′ 58.0336″[1] |
Apparent magnitude (V) | 2.42[2] (2.31 – 2.74)[3] |
Characteristics | |
Spectral type | M2.5II–IIIe[4] |
U−B color index | +1.96[2] |
B−V color index | +1.67[2] |
Variable type | Semi-regular[5] |
Astrometry | |
Radial velocity (Rv) | +8.7[6] km/s |
Proper motion (μ) | RA: +187.65[1] mas/yr Dec.: +136.93[1] mas/yr |
Parallax (π) | 16.64 ± 0.15 mas[1] |
Distance | 196 ± 2 ly (60.1 ± 0.5 pc)[1] |
Absolute magnitude (MV) | −1.41[7] |
Details | |
Mass | 1.7±0.3[8] M☉ |
Radius | 104[8][lower-alpha 1] R☉ |
Luminosity | 1,644[8][lower-alpha 2] L☉ |
Surface gravity (log g) | 1.20[9] cgs |
Temperature | 3,606[8] K |
Metallicity [Fe/H] | −0.11[9] dex |
Rotational velocity (v sin i) | 9.7[10] km/s |
Other designations | |
Database references | |
SIMBAD | data |
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