Omicron Pegasi

Omicron Pegasi
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pegasus
Right ascension 22h 41m 45.39893s[1]
Declination +29° 18′ 27.5542″[1]
Apparent magnitude (V) +4.80[2]
Characteristics
Spectral type A1 IV[3]
U−B color index +0.035[4]
B−V color index −0.013±0.002[2]
Astrometry
Radial velocity (Rv)+8.5±0.1[2] km/s
Proper motion (μ) RA: −0.106[1] mas/yr
Dec.: −31.691[1] mas/yr
Parallax (π)11.4116 ± 0.4055 mas[1]
Distance290 ± 10 ly
(88 ± 3 pc)
Absolute magnitude (MV)−0.01[3]
Details
Mass2.24[5] M☉
Luminosity104.24[2] L☉
Surface gravity (log g)3.77±0.14[5] cgs
Temperature9,956±338[5] K
Metallicity [Fe/H]0.0[3] dex
Rotational velocity (v sin i)6.0±0.2[3] km/s
Age184[5] Myr
Other designations
ο Peg, 43 Pegasi, BD+28°4436, HD 214994, HIP 112051, HR 8641, SAO 90717[6]
Database references
SIMBADdata

ο Pegasi, Latinized as Omicron Pegasi, is a suspected astrometric binary[7] star system in the northern constellation of Pegasus. It is white in hue and visible to the naked eye as a faint point of light with an apparent visual magnitude of +4.80.[2] The distance to this system is approximately 290 light years based on parallax,[1] and it is drifting further away from the Sun with a radial velocity of +8.5 km/s.[2]

The visible component has a stellar classification of A1 IV,[3] matching a subgiant star that has begun to cool, expand and brighten off the main sequence. It has very narrow lines due to a low projected rotational velocity of 6 km/s. The abundances of iron are Sun-like, while it displays an overabundance of heavier elements. Some studies have suggested it is an Am-like star.[3] Omicron Pegasi is an estimated 184 million years old with 2.24 times the mass of the Sun.[5] It is radiating 104[2] times the Sun's luminosity from its photosphere at an effective temperature of 9,956 K.[5]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference Gray2014 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference UBV was invoked but never defined (see the help page).
  5. ^ a b c d e f Cite error: The named reference David2015 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).