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Star in the constellation Pegasus From Wikipedia, the free encyclopedia
2 Pegasi is a single[9] star in the constellation Pegasus, located approximately 394 light years away from the Sun based on parallax.[1] It is visible to the naked eye as a faint, red-hued star with an apparent visual magnitude of 4.52.[2] The object is moving closer to the Earth with a heliocentric radial velocity of −19 km/s.[6] It has a magnitude 12.7 visual companion, designated component B, at an angular separation of 30.4″.[10]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Pegasus |
Right ascension | 21h 29m 56.89545s[1] |
Declination | 23° 38′ 19.8170″[1] |
Apparent magnitude (V) | 4.52[2] |
Characteristics | |
Evolutionary stage | AGB[3] |
Spectral type | M1+III[4] |
U−B color index | +1.93[5] |
B−V color index | +1.62[5] |
Astrometry | |
Radial velocity (Rv) | −18.92[6] km/s |
Proper motion (μ) | RA: +24.74[1] mas/yr Dec.: +3.63[1] mas/yr |
Parallax (π) | 8.28 ± 0.18 mas[1] |
Distance | 394 ± 9 ly (121 ± 3 pc) |
Absolute magnitude (MV) | −0.89[2] |
Details | |
Radius | 55[7] R☉ |
Luminosity | 653[7] L☉ |
Temperature | 3,919[7] K |
Other designations | |
Database references | |
SIMBAD | data |
This is an aging red giant star with a stellar classification of M1+III,[4] currently on the asymptotic giant branch,[3] having exhausted the hydrogen at its core and evolved away from the main sequence. The star has expanded to an estimated 55 times the radius of the Sun.[7] It is radiating 653 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,919 K.[7]
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