The Bayer designation Tau Hydrae (τ Hya, τ Hydrae) is shared by two star systems in the equatorial constellation of Hydra. The two stars are separated by 1.74° in the sky.
τ1 Hydrae, triple star system
τ2 Hydrae, astrometric binary
The stars τ1 Hya and τ2 Hya, along with ι Hya and the 5th‑magnitude 33 Hya (A Hydrae), were Ptolemy's Καμπή (Kampē); but Kazwini knew them as ʽUḳdah, the Knot.[1] According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Uḳdah were the title for four stars: τ1 Hya as Uḳdah I, τ2 Hya as Uḳdah II, 33 Hya as Uḳdah III and ι Hya as Uḳdah IV[2]
In Chinese, 柳宿 (Xīng Sù), meaning Star (asterism), refers to an asterism consisting of τ1 and τ2 Hydrae, Alphard, ι Hydrae, 26 Hydrae, 27 Hydrae, HD 82477 and HD 82428.[3] Consequently, τ1 and τ2 Hydrae are known as 星宿二 (Xīng Sù èr, English: the Second Star of Star) and 星宿三 (Xīng Sù sān, English: the Third Star of Star) respectively.[4]
^Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York, NY: Dover Publications Inc. p. 250. ISBN 0-486-21079-0. Retrieved 2010-12-12.
^Jack W. Rhoads - Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars, Jet Propulsion Laboratory, California Institute of Technology; November 15, 1971
^(in Chinese)中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
^(in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 29 日
The Bayer designation TauHydrae (τ Hya, τ Hydrae) is shared by two star systems in the equatorial constellation of Hydra. The two stars are separated...
Sun. ι Hydrae (Latinised to Iota Hydrae) is the star's Bayer designation. This star along with Tau¹ Hydrae, Tau² Hydrae and 33 Hydrae (A Hydrae), were...
TW Hydrae is a T Tauri star approximately 196 light-years away in the constellation of Hydra (the Sea Serpent). TW Hydrae is about 80% of the mass of the...
TW Hydrae b is a likely extrasolar planet orbiting the young T Tauri star TW Hydrae approximately 176 light-years (54 parsecs, or nearly 1.665×1016 km)...
537S. Donati, J. -F. (January 1999), "Magnetic cycles of HR 1099 and LQ Hydrae", Monthly Notices of the Royal Astronomical Society, 302 (3): 457–481, Bibcode:1999MNRAS...
heliosphere. In 2006, a far infrared bow shock was detected near the AGB star R Hydrae. Bow shocks are also a common feature in Herbig Haro objects, in which a...
14-30 MHz band was detected from the Tau Boötis system, likely associated with cyclotron radiation from the poles of Tau Boötis b a signature of a planetary...
Albireo Double star 3.10 Zeta Hydrae Star 3.11 3.05 Eta Sagittarii Binary star system 3.11 Alpha Indi Star 3.11 Nu Hydrae Star 3.11 Kappa Centauri Binary...
Andrew W.; Faherty, Jacqueline K.; Bédard, Antoine (2020-11-01). "The μ Tau Association: A 60 Myr Old Coeval Group at 150 pc from the Sun". The Astrophysical...
are also candidates for directly imaged protoplanetary disks, such as TW Hydrae or directly imaged exoplanets, such as Beta Pictoris b or GU Psc b. A stellar...
those of more than half of T Tauri stars such as AA Tauri as well as TW Hydrae, IRC +10216 and APM 08279+5255, VY Canis Majoris and S Persei. Liquid water...
150 light-years (45 parsecs) away. The system is located within the TW Hydrae association (TWA), and has received the designation TWA 4. The system consists...
(2002). "Starspots and active regions on the emission red dwarf star LQ Hydrae". Astronomy and Astrophysics. 396: 203–211. Bibcode:2002A&A...396..203A...
Baron, F. (June 2018). "The convective photosphere of the red supergiant CE Tau. I. VLTI/PIONIER H-band interferometric imaging". Astronomy & Astrophysics...
Christopher J. (2000-08-01). "WFPC2 Images of a Face-on Disk Surrounding TW Hydrae". The Astrophysical Journal. 538 (2): 793–800. Bibcode:2000ApJ...538..793K...
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Centre de données astronomiques de Strasbourg. Retrieved 2010-06-21. "bet Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-06-21...
time TTS – (celestial object) T-Tauri star TWA – (celestial object) TW Hydrae Association TYC – (catalog) Tycho, a catalog that was the predecessor of...
the first quadruple star system with an Earth-sized planet. Xi Tauri (ξ Tau, ξ Tauri), located about 222 light years away, is a spectroscopic and eclipsing...
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