Chi2 Orionis
 
| |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Orion |
| Right ascension | 06h 03m 55.18482s[1] |
| Declination | +20° 08′ 18.4316″[1] |
| Apparent magnitude (V) | 4.63[2][3] |
| Characteristics | |
| Spectral type | B2Ia[2] |
| U−B color index | −0.68[3] |
| B−V color index | +0.28[3] |
| R−I color index | +0.22[3] |
| Variable type | α Cyg[4] |
| Astrometry | |
| Radial velocity (Rv) | 16.8 ± 0.9[5] km/s |
| Proper motion (μ) | RA: 1.88[1] mas/yr Dec.: −2.10[1] mas/yr |
| Parallax (π) | 1.81 ± 0.28[1] mas |
| Distance | approx. 1,800 ly (approx. 550 pc) |
| Absolute magnitude (MV) | -7.6[2] |
| Details | |
| Mass | 42.3 ± 1.0[6] M☉ |
| Radius | 61.9[2] R☉ |
| Luminosity | 446,000[2] L☉ |
| Surface gravity (log g) | 2.35[2] cgs |
| Temperature | 19,000[2] K |
| Rotational velocity (v sin i) | 72[2] km/s |
| Age | 5 ± 0.6[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Chi2 Orionis (Chi2 Ori / χ2 Orionis / χ2 Ori) is a B-type supergiant star in the constellation of Orion. It has an apparent visual magnitude of 4.63. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.[7]
Chi1 Orionis is an unrelated yellow main sequence star over two degrees away.
References
- 1 2 3 4 5 van Leeuwen, F. (November 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.
- 1 2 3 4 5 6 7 8 Crowther, P. A.; Lennon, D. J.; Walborn, N. R. (2006). "Physical parameters and wind properties of galactic early B supergiants". Astronomy and Astrophysics 446: 279–293. arXiv:astro-ph/0509436. Bibcode:2006A&A...446..279C. doi:10.1051/0004-6361:20053685.
- 1 2 3 4 HR 2135, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line January 14, 2011.
- ↑ khi 2 Ori, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line January 14, 2011.
- ↑ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
- 1 2 Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society 410: 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x.
- ↑ Garrison, R. F. (December 1993), "Anchor Points for the MK System of Spectral Classification", Bulletin of the American Astronomical Society 25: 1319, Bibcode:1993AAS...183.1710G, retrieved 2012-02-04
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