Chi1 Hydrae

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For other stars with this Bayer designation, see χ Hydrae
Chi1 Hydrae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Hydra
Right ascension 11h 05m 19.90766s[1]
Declination −27° 17′ 36.9957″[1]
Apparent magnitude (V) 4.94[2]
Characteristics
Spectral type F4 V + F7 V[3]
U−B color index +0.04[2]
B−V color index +0.36[2]
Astrometry
Radial velocity (Rv)+19.1±1.6[4] km/s
Proper motion (μ) RA: −190.728[5] mas/yr
Dec.: −6.273[5] mas/yr
Parallax (π)22.8323 ± 0.1828[5] mas
Distance143 ± 1 ly
(43.8 ± 0.4 pc)
Absolute magnitude (MV)1.74[6]
Orbit[7]
Period (P)7.5535±0.0064 yr
Semi-major axis (a)0.1388±0.0016″
Eccentricity (e)0.349±0.015
Inclination (i)96.50±0.84°
Longitude of the node (Ω)224.00±0.59°
Periastron epoch (T)1983.455 ± 0.084
Argument of periastron (ω)
(secondary)		343.0±4.3°
Details
χ1 Hya A
Mass1.93[8] M☉
Radius3.19[5] R☉
Luminosity17.798[5] L☉
Temperature6,637[5] K
Metallicity [Fe/H]−0.10[6] dex
Age1.3[6] Gyr
χ1 Hya B
Mass1.93[8] M☉
Other designations
χ1 Hya, CD−26°8338, FK5 419, GJ 3642, HD 96202, HIP 54204, HR 4314, SAO 179514[9]
Database references
SIMBADdata

Chi1 Hydrae (χ1 Hydrae) is a binary star[3] in the equatorial constellation of Hydra. It originally received the Flamsteed designation of 9 Crateris before being placed in the Hydra constellation.[10] Based upon an annual 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 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] The pair circle each other with an orbital period of 7.55 years with an eccentricity of 0.35.[7]

References[]

  1. ^ 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.
  2. ^ 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), Bibcode:1966CoLPL...4...99J.
  3. ^ 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.
  4. ^ 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.
  5. ^ 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.
  6. ^ 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.
  7. ^ 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.
  8. ^ 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.
  9. ^ "chi01 Hya". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-17.CS1 maint: postscript (link)
  10. ^ 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.
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