| dist_ly=
| dist_pc=
| absmag_v=+0.416[10]
| component2 = θ2 Tauri
| parallax2 = 20.8354
| p_error2 = 0.3731
| parallax_footnote2 = [11]
| dist_ly2=
| dist_pc2=
| absmag_v2 = +0.30/+1.44[12]
}}{{Starbox orbit
| reference = [13]
| primary = A
| name = B
| period_unitless = 5,997 days
| axis =
| eccentricity = 0.64
| inclination =
| k1 = 8.39
}}{{Starbox orbit
| reference = [12]
| primary = Aa
| name = Ab
| period_unitless = 140.7302 days
| eccentricity = 0.7360
| axis = 18.91
| inclination = 47.8
| k1 = 32.95
| k2 = 43.68
}}{{Starbox detail
| component1 = Aa
| mass = 2.86[15]
| radius = 4.4[15]
| temperature = 7,800[15]
| gravity = 3.6[15]
| luminosity = 59[12]
| rotational_velocity = 68.4[12]
| component2 = Ab
| mass2 = 2.16[15]
| radius2 = 2.7[15]
| temperature2 = 7,800[12]
| luminosity2 = 21[12]
| rotational_velocity2 = 113[12]
| age_myr2 = 650[12]
}}{{Starbox detail|no_heading=y
| component1 = θ1 Tauri
| mass = 2.67[27]
| radius = 10.55[27]
| temperature = 5,080[27]
| gravity = 3.21[27]
| luminosity = 71[27]
| rotational_velocity = 1.40[27]
| metal_fe = +0.14[27]
| age_myr = 510[27]
}}{{Starbox catalog
| names = θ Tauri
| component1 = θ1 Tauri
| names1 = Chamukuy, 77 Tauri, BD+15 631, HD 28307, HIP 20885, HR 1411, SAO 93955
| component2 = θ2 Tauri
| names2 = 78 Tauri, BD+15 632, HD 28319, HIP 20894, HR 1412, SAO 93957
}}{{Starbox reference
| Simbad = HD+28307|sn=θ1 Tauri
| Simbad2 = HD+28319|sn2=θ2 Tauri
}}{{Starbox end}}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 and Theta² Tauri. 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 {{Convert|152|ly|pc|abbr=on}}, while Theta² Tauri is at a distance of {{Convert|157|ly|pc|abbr=off}}. θ Tauri A and B are both spectroscopic binaries; the four components are designated Theta Tauri Aa (also named Chamukuy), Ab, Ba, and Bb.
Nomenclature
θ Tauri (Latinised to Theta Tauri) is the double star's Bayer designation; θ1 Tauri and θ2 Tauri those of its two constituents. The designations of the two constituents as Theta Tauri A and B, and those of the four components - Theta Tauri Aa, Ab, Ba and Bb - derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).[35]In the mythology of the Maya peoples, Theta Tauri is known as Chamukuy, meaning a small bird in the Yucatec Maya language.[36] In 2016, the IAU organized a Working Group on Star Names (WGSN)[37] to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[38] It approved the name Chamukuy for the component Theta Tauri Aa on 5 September 2017 and it is now so included in the List of IAU-approved Star Names.[39]
In Chinese, {{lang|zh|畢宿}} ({{lang|zh-Latn|Bì Xiù}}), meaning Net, refers to an asterism consisting of Theta² Tauri, Epsilon Tauri (named Ain), Delta³ Tauri, Delta¹ Tauri, Gamma Tauri, Alpha Tauri (Aldebaran), 71 Tauri and Lambda Tauri.[40] Consequently, Theta² Tauri itself is known as {{lang|zh|畢宿六}} ({{lang|zh-Latn|Bì Xiù liù}}), "the Sixth Star of Net".[41]
Properties
Theta Tauri A is the dimmer constituent. Its primary component, Theta Tauri Aa, is an orange K-type giant with an apparent magnitude of +3.84. The secondary, Theta Tauri Ab, is of the 7th-magnitude. It has a mass of {{solar mass|1.31}} and orbits the primary every 16.26 years on a fairly eccentric (at 0.570) orbit.[42]
Theta Tauri B has a mean apparent magnitude of +3.40. It is classified as a Delta Scuti type variable star and its brightness varies from magnitude +3.35 to +3.42 with a period of 1.82 hours.[43] Its primary component, Theta Tauri Ba, is a white A-type giant. The secondary, Theta Tauri Bb, is of the 6th magnitude and is 0.005 arcseconds, or at least 2 AU, distant. It completes an orbit once every 141 days.
References
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