Omicron Tauri

Omicron Tauri
Location of ο Tauri (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Taurus
Right ascension 03h 24m 48.79832s[1]
Declination +09° 01′ 43.9306″[1]
Apparent magnitude (V) 3.61[2]
Characteristics
Spectral type G6 III[3]
B−V color index +0.887±0.019[2]
Astrometry
Radial velocity (Rv)−19.79±0.06[4] km/s
Proper motion (μ) RA: −67.04 mas/yr[5]
Dec.: −78.04 mas/yr[5]
Parallax (π)12.11 ± 0.87 mas[5]
Distance270 ± 20 ly
(83 ± 6 pc)
Absolute magnitude (MV)−1.23[6]
Orbit[7]
Period (P)1654.9 d
Eccentricity (e)0.26
Periastron epoch (T)2429974.34 JD
Argument of periastron (ω)
(secondary)		155.6°
Semi-amplitude (K1)
(primary)		4.4 km/s
Details[6]
ο Tauri A
Mass3.21±0.12 M☉
Radius20.28±3.66 R☉
Luminosity302[8] L☉
Surface gravity (log g)2.43±0.06 cgs
Temperature5,094±15 K
Metallicity [Fe/H]−0.13±0.02 dex
Rotational velocity (v sin i)3.29±0.61 km/s
Age324+39
−35 Myr
Other designations
ο Tau, 1 Tauri, BD+08° 511, FK5 121, HD 21120, HIP 15900, HR 1030, SAO 111172[1]
Database references
SIMBADdata

ο Tauri, Latinized as Omicron Tauri, is a binary star system in the constellation Taurus, near the constellation border with Cetus. It has a yellow hue and is visible to the naked eye with an apparent visual magnitude of 3.61.[2] It is approximately 270 light years from the Sun based on parallax,[5] but is drifting closer with a radial velocity of −20 km/s.[4] As the westernmost bright point of light in Taurus, this system has the Flamsteed designation 1 Tauri; Omicron Tauri is the Bayer designation.[1]

This is a single-lined spectroscopic binary[7] system with the two components orbiting each other over a period of 4.53 years with an eccentricity of 0.263.[9] The visible component is an aging G-type giant with a stellar classification of G6 III.[3] This star has three times the mass of the Sun and 20[6]–18 times the Sun's radius. Based on the latter, interferometry-measured radius, it is rotating once every 533 days.[10] It is radiating 302[8] times the luminosity of the Sun from its photosphere at an effective temperature of 5,094 K.[6]

  1. ^ a b c d Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference perkins was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Deka-Szymankiewicz was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Pourbaix2004 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference apj125_712 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference aaa421_241 was invoked but never defined (see the help page).