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Theta Tauri

θ Tauri

Hyades showing θ Tauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Taurus
θ1 Tauri
Right ascension 04h 28m 34.49209s[1]
Declination +15° 57′ 44.2832″[2]
Apparent magnitude (V) +3.84
θ2 Tauri
Right ascension 04h 28m 39.74455s[1]
Declination +15° 52′ 15.1226″[2]
Apparent magnitude (V) +3.35 - 3.42[3]
Characteristics
θ1 Tauri
Spectral type G9 III Fe-0.5[4]
θ2 Tauri
Spectral type A7 III[5]
Variable type δ Scuti[3]
Astrometry
θ1 Tauri
Parallax (π)21.4183±0.3731 mas[1]
Distance152 ± 3 ly
(46.7 ± 0.8 pc)
Absolute magnitude (MV)+0.416[6]
θ2 Tauri
Parallax (π)20.8354 ± 0.3731 mas[2]
Distance157 ± 3 ly
(48.0 ± 0.9 pc)
Absolute magnitude (MV)+0.08[7]
Orbit[8]
PrimaryA
CompanionB
Period (P)5,997 days
Eccentricity (e)0.64
Semi-amplitude (K1)
(primary)		8.39 km/s
Orbit[9]
PrimaryAa
CompanionAb
Period (P)140.7302 days
Semi-major axis (a)18.91″
Eccentricity (e)0.7360
Inclination (i)47.8°
Semi-amplitude (K1)
(primary)		32.95 km/s
Semi-amplitude (K2)
(secondary)		43.68 km/s
Details
Aa
Mass2.86[10] M☉
Radius4.4[10] R☉
Luminosity59[9] L☉
Surface gravity (log g)3.6[10] cgs
Temperature7,800[10] K
Rotational velocity (v sin i)68.4[9] km/s
Ab
Mass2.16[10] M☉
Radius2.7[10] R☉
Luminosity21[9] L☉
Temperature7,800[9] K
Rotational velocity (v sin i)113[9] km/s
Age650[9] Myr
θ1 Tauri
Mass2.67[11] M☉
Radius9.42±0.22[12] R☉
Luminosity47.7±2.3[12] L☉
Surface gravity (log g)3.21[11] cgs
Temperature4,940±55[12] K
Metallicity [Fe/H]+0.14[11] dex
Rotational velocity (v sin i)1.40[11] km/s
Age510[11] Myr
Other designations
θ Tauri
θ1 Tauri: 77 Tauri, BD+15 631, HD 28307, HIP 20885, HR 1411, SAO 93955
θ2 Tauri: Chamukuy, 78 Tauri, BD+15 632, HD 28319, HIP 20894, HR 1412, SAO 93957
Database references
SIMBADθ1 Tauri
θ2 Tauri

Theta Tauri (θ Tauri, abbreviated Theta Tau, θ Tau) is a wide double star in the constellation of Taurus and a member of the Hyades open cluster.

θ Tauri is composed of two 3rd magnitude stars, designated Theta1 Tauri (Theta Tauri B) and Theta2 Tauri (Theta Tauri A). Theta² is brighter, hence the pair are sometimes referred to as Theta Tauri B and A, respectively. They are separated by 5.62 arcminutes (0.094°) on the sky. Based upon parallax measurements, Theta¹ Tauri is located at a distance of 152 ly (47 pc), while Theta² Tauri is at a distance of 157 light-years (48 parsecs). θ Tauri A and B are both spectroscopic binaries; the four components are designated Theta Tauri Aa (formally named Chamukuy /ˈtʃɑːmuːkuːi/), Ab, Ba, and Bb.

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