Omega1 Tauri

For other stars with this Bayer designation, see ω Tauri.
Omega1 Tauri
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Taurus
Right ascension 02h 12m 22.28003s[1]
Declination +30° 18′ 11.0430″[1]
Apparent magnitude (V) +5.51[2]
Characteristics
Spectral type K2 III[2]
B−V color index 1.077[2]
Astrometry
Radial velocity (Rv)+24.75±0.02[2] km/s
Proper motion (μ) RA: −65.05[1] mas/yr
Dec.: −60.50[1] mas/yr
Parallax (π)11.22 ± 0.70 mas[1]
Distance290 ± 20 ly
(89 ± 6 pc)
Absolute magnitude (MV)+0.76[2]
Details
Mass1.53[3] M☉
Radius12[4] R☉
Luminosity57.5[3] L☉
Surface gravity (log g)2.5[5] cgs
Temperature4,737±77[3] K
Metallicity [Fe/H]0.12[5] dex
Rotational velocity (v sin i)4.6[4] km/s
Age4.21[3] Gyr
Other designations
ω1 Tau, 43 Tau, BD+19° 672, FK5 1115, HD 26162, HIP 19388, HR 1283, SAO 93785[6]
Database references
SIMBADdata

Omega1 Tauri is a solitary,[7] orange hued star in the zodiac constellation of Taurus. It is faintly visible to the naked eye with an apparent visual magnitude of +5.51.[2] Based upon an annual parallax shift of 11.22 mas as seen from Earth,[1] it is located about 290 light years from the Sun.

This is an evolved K-type giant star with a stellar classification of K2 III.[2] At the estimated age of 4.2 billion years,[3] it is a red clump star that is generating energy by helium fusion at its core.[5] Omega1 Tauri has about 1.5[3] times the mass of the Sun and has expanded to around 12[4] times the Sun's radius. It is radiating 57.5 times the Sun's luminosity from its photosphere at an effective temperature of 4,737 K.[3] The radial velocity of this star shows no appreciable variation, and for this reason it is used as a radial velocity standard.[2]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h Cite error: The named reference Hekker2006 was invoked but never defined (see the help page).
  3. ^ a b c d e f g Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Tautvaisiene2013 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).