Chi1 Hydrae
Star in the constellation Hydra
Chi1 Hydrae (χ1 Hydrae ) is a binary star [ 3] constellation of Hydra . It originally received the Flamsteed designation of 9 Crateris before being placed in the Hydra constellation.[ 10] parallax shift of 22.8 mas as seen from Earth, it is located about 143 light years from the Sun . It is visible to the naked eye with a combined apparent visual magnitude of 4.94.[ 2]
The two components of this system appear to have equal masses of 1.93 times the mass of the Sun .[ 7] orbital period of 7.55 years with an eccentricity of 0.35.[ 7]
References
^ a b van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics , 474 (2): 653–664, arXiv :0708.1752 Bibcode :2007A&A...474..653V , doi :10.1051/0004-6361:20078357 , S2CID 18759600 . ^ a b c d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory , 4 (99): 99, Bibcode :1966CoLPL...4...99J . ^ a b Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, arXiv :0806.2878 Bibcode :2008MNRAS.389..869E , doi :10.1111/j.1365-2966.2008.13596.x S2CID 14878976 . ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics , 546 : 14, arXiv :1208.3048 Bibcode :2012A&A...546A..61D , doi :10.1051/0004-6361/201219219 , S2CID 59451347 , A61. ^ a b c d e f Brown, A. G. A. ; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties" . Astronomy & Astrophysics 616 . A1. arXiv :1804.09365 Bibcode :2018A&A...616A...1G doi :10.1051/0004-6361/201833051 Gaia DR2 record for this source at VizieR .^ a b c Nordström, B.; et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs", Astronomy and Astrophysics , 418 : 989–1019, arXiv :astro-ph/0405198 Bibcode :2004A&A...418..989N , doi :10.1051/0004-6361:20035959 , S2CID 11027621 . ^ a b c Mason, Brian D.; et al. (February 1999), "Binary Star Orbits from Speckle Interferometry. I. Improved Orbital Elements of 22 Visual Systems", The Astronomical Journal , 117 (2): 1023–1036, Bibcode :1999AJ....117.1023M , doi :10.1086/300748 ^ a b Jaime, Luisa G.; et al. (December 2012), "Regions of dynamical stability for discs and planets in binary stars of the solar neighbourhood", Monthly Notices of the Royal Astronomical Society , 427 (4): 2723–2733, arXiv :1208.2051 Bibcode :2012MNRAS.427.2723J , doi :10.1111/j.1365-2966.2012.21839.x S2CID 118570249 . ^ "chi01 Hya" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2017-03-17 .{{cite web }}: CS1 maint: postscript (link )^ Wagman, M. (August 1987), "Flamsteed's Missing Stars", Journal for the History of Astronomy , 18 (3): 216, Bibcode :1987JHA....18..209W , doi :10.1177/002182868701800305 , S2CID 118445625 .
