Epsilon Pegasi
Star in the northern constellation of Pegasus / From Wikipedia, the free encyclopedia
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Epsilon Pegasi (Latinised from ε Pegasi, abbreviated Epsilon Peg, ε Peg), formally named Enif /ˈiːnɪf/, is the brightest star in the northern constellation of Pegasus.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Pegasus |
Right ascension | 21h 44m 11.15614s[1] |
Declination | +09° 52′ 30.0311″[1] |
Apparent magnitude (V) | 2.399[1] (2.37 - 2.45) |
Characteristics | |
Spectral type | K2 Ib-II[2] |
U−B color index | +1.722[3] |
B−V color index | +1.527[3] |
Variable type | LC[4] |
Astrometry | |
Radial velocity (Rv) | 3.39 ± 0.06[5] km/s |
Proper motion (μ) | RA: +26.92[1] mas/yr Dec.: +0.4[1] mas/yr |
Parallax (π) | 4.73 ± 0.17 mas[1] |
Distance | 690 ± 20 ly (211 ± 8 pc) |
Absolute magnitude (MV) | –4.142[6] |
Details | |
Mass | 7.07[7]–12[8] M☉ |
Radius | 211[7] R☉ |
Luminosity | 9,716 - 9,898[7] L☉ |
Luminosity (visual, LV) | 3,895[9] L☉ |
Surface gravity (log g) | 1.01[6] cgs |
Temperature | 3,965[7] K |
Metallicity [Fe/H] | –0.04[6] dex |
Rotational velocity (v sin i) | 8[10] km/s |
Age | 20.0 ± 4.5[11] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Close
With an average apparent visual magnitude of 2.4,[3] this is a second-magnitude star that is readily visible to the naked eye. The distance to this star can be estimated using parallax measurements from the Hipparcos astrometry satellite,[13][14] yielding a value of around 690 light-years (210 parsecs).[1]