Omicron Tauri

Omicron Tauri
Location of ο Tauri (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Taurus
Right ascension 03h 24m 48.79146s[1]
Declination +09° 01′ 43.9941″[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[1] km/s
Proper motion (μ) RA: –59.776[1] mas/yr
Dec.: –78.579[1] mas/yr
Parallax (π)17.1066 ± 0.3775 mas[1]
Distance191 ± 4 ly
(58 ± 1 pc)
Absolute magnitude (MV)−0.45[4]
Orbit[5]
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
ο Tauri A
Mass3.01[4] M☉
Radius18.10+1.45
−6.63[1] R☉
Luminosity149.4±3.7[1] L☉
Surface gravity (log g)2.52[4] cgs
Temperature5,180[4] K
Metallicity [Fe/H]–0.12[4] dex
Rotational velocity (v sin i)25 ± 2[6] km/s
Age380[4] Myr
Other designations
ο Tau, 1 Tauri, BD+08° 511, FK5 121, HD 21120, HIP 15900, HR 1030, SAO 111172[7]
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 191 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −20 km/s.[1] As the westernmost bright point of light in Taurus, this system has the Flamsteed designation 1 Tauri; Omicron Tauri is the Bayer designation.[7]

This is a single-lined spectroscopic binary[5] system with the two components orbiting each other over a period of 4.53 years with an eccentricity of 0.263.[8] The visible component is an aging G-type giant with a stellar classification of G6 III.[3] This star has three[4] times the mass of the Sun and eighteen[1] times the Sun's radius. Based on the latter, interferometry-measured radius, it is rotating once every 533 days.[9] It is radiating 149[1] times the luminosity of the Sun from its photosphere at an effective temperature of 5,180 K.[4]

  1. ^ a b c d e f g h i j k Cite error: The named reference GaiaDR2 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 c d e f g h Cite error: The named reference aaa458_2_609 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Pourbaix2004 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference AAA550_A26 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference apj125_712 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference aaa421_241 was invoked but never defined (see the help page).