Chi Ophiuchi
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 16h 27m 01.4349s[1] |
| Declination | −18° 27′ 22.504″[1] |
| Apparent magnitude (V) | 4.18 to 5.0[2] |
| Characteristics | |
| Spectral type | B2Vne[1] |
| U−B color index | −0.75[3] |
| B−V color index | +0.28[3] |
| R−I color index | +0.22[3] |
| Variable type | GCAS[2] |
| Astrometry | |
| Radial velocity (Rv) | −3.2 ± 5[1] km/s |
| Proper motion (μ) | RA: −5.58[1] mas/yr Dec.: −22.22[1] mas/yr |
| Parallax (π) | 6.67 ± 0.74[1] mas |
| Distance | approx. 490 ly (approx. 150 pc) |
| Absolute magnitude (MV) | −4.6[4] |
| Details | |
| Mass | 10.1 ± 0.7[5] M☉ |
| Radius | 4.5[6] R☉ |
| Luminosity | 200,000[4] L☉ |
| Surface gravity (log g) | 4.13[4] cgs |
| Temperature | 41,700[4] K |
| Rotational velocity (v sin i) | 134[3] km/s |
| Age | 22.5 ± 2.6[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Chi Ophiuchi (Chi Oph / χ Ophiuchi / χ Oph) is a Be star in the constellation of Ophiuchus.[1] It has an apparent visual magnitude which varies between 4.18 and 5.0.[2]
This star is a proper motion member of the Upper Scorpius sub-group in the Scorpius-Centaurus OB association, the nearest such co-moving association of massive stars to the Sun.[4]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 * chi Oph -- Be Star, database entry, SIMBAD. Accessed on line January 12, 2011.
- ↑ 2.0 2.1 2.2 khi Oph, 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 12, 2011.
- ↑ 3.0 3.1 3.2 3.3 HR 6118, 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 12, 2011.
- ↑ 4.0 4.1 4.2 4.3 4.4 de Geus, P. T.; de Zeeuw; Lub, J. (June 1989), "Physical parameters of stars in the Scorpio-Centaurus OB association", Astronomy and Astrophysics 216 (1-2): 44–61, Bibcode:1989A&A...216...44D
- ↑ 5.0 5.1 Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (january 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x
- ↑ HD 148184, database entry, Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS), 3rd edition, L. E. Pasinetti-Fracassini, L. Pastori, S. Covino, and A. Pozzi, CDS ID II/224. Accessed on line January 12, 2011.
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