Epsilon Pegasi

ε Pegasi
Location of ε Pegasi (circled)
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
Evolutionary stage Red supergiant
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]
Distance690 ± 20 ly
(211 ± 8 pc)
Absolute magnitude (MV)–4.142[6]
Details
Mass11–12[7] M☉
Radius169–185[8] R☉
Luminosity8,508±596[9] L☉
Luminosity (visual, LV)3,895[10] L☉
Surface gravity (log g)1.01[6] cgs
Temperature4,150[11] K
Metallicity [Fe/H]–0.04[6] dex
Rotational velocity (v sin i)8[12] km/s
Age20.0 ± 4.5[13] Myr
Other designations
Enif, 8 Pegasi, BD+09°4891, FK5 815, HD 206778, HIP 107315, HR 8308, SAO 127029[14]
Database references
SIMBADdata

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.

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,[15][16] yielding a value of around 690 light-years (210 parsecs).[1]

  1. ^ a b c d e f g Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
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