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] |
Distance | 191 ± 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 | |
Mass | 3.01 [4] M☉ |
Radius | 18.10+1.45 −6.63 [1] R☉ |
Luminosity | 149.4±3.7 [1] L☉ |
Surface gravity (log g) | 2.52 [4] cgs |
Temperature | 5,180 [4] K |
Metallicity [Fe/H] | –0.12 [4] dex |
Rotational velocity (v sin i) | 25 ± 2 [6] km/s |
Age | 380 [4] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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]
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] |
Distance | 191 ± 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 | |
Mass | 3.01 [4] M☉ |
Radius | 18.10+1.45 −6.63 [1] R☉ |
Luminosity | 149.4±3.7 [1] L☉ |
Surface gravity (log g) | 2.52 [4] cgs |
Temperature | 5,180 [4] K |
Metallicity [Fe/H] | –0.12 [4] dex |
Rotational velocity (v sin i) | 25 ± 2 [6] km/s |
Age | 380 [4] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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]