Omicron Virginis

This article is about ο (Omicron) Virginis. For o Virginis, see 78 Virginis.
ο Virginis
Location of ο Virginis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Virgo
Right ascension 12h 05m 12.54049s[1]
Declination +08° 43′ 58.7498″[1]
Apparent magnitude (V) 4.12[2]
Characteristics
Spectral type G8 IIIa CN-1Ba1CH1[3]
Astrometry
Radial velocity (Rv)−29.62[4] km/s
Proper motion (μ) RA: −218.69[1] mas/yr
Dec.: +57.76[1] mas/yr
Parallax (π)19.98 ± 0.22 mas[1]
Distance163 ± 2 ly
(50.1 ± 0.6 pc)
Absolute magnitude (MV)+0.52[5]
Details[4]
Mass2.17 M☉
Radius9.62 R☉
Luminosity57 L☉
Surface gravity (log g)3.17 cgs
Temperature5,107 K
Metallicity [Fe/H]−0.30 dex
Rotational velocity (v sin i)2.23 km/s
Age0.88 Gyr
Other designations
9 Virginis, ο Vir, BD+09°2583, FK5 450, GJ 3703, HD 104979, HIP 58948, HR 4608, SAO 119213
Database references
SIMBADdata

Omicron Virginis (ο Vir, ο Virginis) is a star in the zodiac constellation of Virgo. It is visible to the naked eye with an apparent visual magnitude of +4.12.[5] Based upon parallax measurements, it is about 163 light years from the Sun.

ο Virginis is a G-type giant star with a stellar classification of G8 IIIa CN-1Ba1CH1.[3] This indicates that it is a Barium star. Typically Barium stars are close binaries with a white dwarf companion, but no companion has been detected for ο Virginis.[6] It has been suggested that an excess SiIV emission flux is due to an unseen white dwarf companion.[7]

ο Virginis is a giant star around ten times larger than the Sun. Although it is slightly cooler, it is radiating about 60-132 times the luminosity of the Sun. It is over twice as massive as the Sun and is around a billion years old.[5][4] A simplified statistical analysis suggests that ο Virginis is likely to be a red giant branch star fusing hydrogen in a shell around an inert helium core, but there is about a 22% chance that it is a horizontal branch star fusing helium in its core.[8]

  1. ^ a b c d e Cite error: The named reference van Leeuwen2007 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Mallik1999 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Keenan1989 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference jofre was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Takeda2008 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference zacs was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference bv was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference reffert was invoked but never defined (see the help page).