Astronomy:Chi1 Hydrae
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Short description: Star in the constellation Hydra
| Observation data 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 |
| Distance | 143 ± 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 | |
| Mass | 1.93[8] M☉ |
| Radius | 3.19[5] R☉ |
| Luminosity | 17.798[5] L☉ |
| Temperature | 6,637[5] K |
| Metallicity [Fe/H] | −0.10[6] dex |
| Age | 1.3[6] Gyr |
| χ1 Hya B | |
| Mass | 1.93[8] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 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] The pair circle each other with an orbital period of 7.55 years with an eccentricity of 0.35.[7]
References
- ↑ 1.0 1.1 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 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.
- ↑ 3.0 3.1 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 6.0 6.1 6.2 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, doi:10.1051/0004-6361:20035959, Bibcode: 2004A&A...418..989N.
- ↑ 7.0 7.1 7.2 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, doi:10.1086/300748, Bibcode: 1999AJ....117.1023M.
- ↑ 8.0 8.1 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, doi:10.1111/j.1365-2966.2012.21839.x, Bibcode: 2012MNRAS.427.2723J.
- ↑ "chi01 Hya". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=chi01+Hya.
- ↑ Wagman, M. (August 1987), "Flamsteed's Missing Stars", Journal for the History of Astronomy 18 (3): 216, doi:10.1177/002182868701800305, Bibcode: 1987JHA....18..209W.
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