Theta Tauri
Binary star in the constellation Taurus / From Wikipedia, the free encyclopedia
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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.
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Taurus |
θ1 Tauri | |
Right ascension | 04h 28m 34.49603s[1] |
Declination | +15° 57′ 43.8494″[1] |
Apparent magnitude (V) | +3.84 |
θ2 Tauri | |
Right ascension | 04h 28m 39.74070s[1] |
Declination | +15° 52′ 15.1745″[1] |
Apparent magnitude (V) | +3.35 - 3.42[2] |
Characteristics | |
θ1 Tauri | |
Spectral type | G9 III Fe-0.5[3] |
θ2 Tauri | |
Spectral type | A7 III[4] |
Variable type | δ Scuti[2] |
Astrometry | |
θ1 Tauri | |
Parallax (π) | 21.4183 ± 0.3731 mas[5] |
Distance | 152 ± 3 ly (46.7 ± 0.8 pc) |
Absolute magnitude (MV) | +0.416[6] |
θ2 Tauri | |
Parallax (π) | 20.8354 ± 0.3731 mas[7] |
Distance | 157 ± 3 ly (48.0 ± 0.9 pc) |
Absolute magnitude (MV) | +0.30/+1.44[8] |
Orbit[9] | |
Primary | A |
Companion | B |
Period (P) | 5,997 days |
Eccentricity (e) | 0.64 |
Semi-amplitude (K1) (primary) | 8.39 km/s |
Orbit[8] | |
Primary | Aa |
Companion | Ab |
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 | |
Mass | 2.86[10] M☉ |
Radius | 4.4[10] R☉ |
Luminosity | 59[8] L☉ |
Surface gravity (log g) | 3.6[10] cgs |
Temperature | 7,800[10] K |
Rotational velocity (v sin i) | 68.4[8] km/s |
Ab | |
Mass | 2.16[10] M☉ |
Radius | 2.7[10] R☉ |
Luminosity | 21[8] L☉ |
Temperature | 7,800[8] K |
Rotational velocity (v sin i) | 113[8] km/s |
Age | 650[8] Myr |
θ1 Tauri | |
Mass | 2.67[11] M☉ |
Radius | 10.55[11] R☉ |
Luminosity | 71[11] L☉ |
Surface gravity (log g) | 3.21[11] cgs |
Temperature | 5,080[11] K |
Metallicity [Fe/H] | +0.14[11] dex |
Rotational velocity (v sin i) | 1.40[11] km/s |
Age | 510[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 | |
SIMBAD | θ1 Tauri |
θ2 Tauri |
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.