Chi2 Orionis
From Infogalactic: the planetary knowledge core
 Location of χ2 Orionis (circled) |
|
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 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.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
