74 Ophiuchi
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 18h 20m 52.06316s[1] |
| Declination | 3° 22′ 37.7994″[1] |
| Apparent magnitude (V) | 4.85[2] |
| Characteristics | |
| Spectral type | G8III[3] |
| U−B color index | +0.61[4] |
| B−V color index | +0.91[4] |
| Astrometry | |
| Radial velocity (Rv) | +4.35[5] km/s |
| Proper motion (μ) | RA: +1.79[1] mas/yr Dec.: +8.88[1] mas/yr |
| Parallax (π) | 12.52 ± 0.33 mas[1] |
| Distance | 261 ± 7 ly (80 ± 2 pc) |
| Absolute magnitude (MV) | 0.34[2] |
| Details | |
| Mass | 2.38[6] M☉ |
| Radius | 11.60[6] R☉ |
| Luminosity | 76.3[6] L☉ |
| Surface gravity (log g) | 2.70[6] cgs |
| Temperature | 5,012[6] K |
| Metallicity [Fe/H] | -0.21[6] dex |
| Rotational velocity (v sin i) | < 1.0[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
74 Ophiuchi is a class G8III[3] (yellow giant) star in the constellation Ophiuchus. Its apparent magnitude is 4.85[2] and it is approximately 261 light years away based on parallax.[1]
The primary has two reported companions: B, with magnitude 12.08 and separation 27.5", and C, with magnitude 12.28 and separation 57.9".[8]
References
- ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
- ^ a b c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. Vizier catalog entry
- ^ a b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
- ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42: 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
- ^ Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey (2008). "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity". The Astronomical Journal. 135: 209. Bibcode:2008AJ....135..209M. doi:10.1088/0004-6256/135/1/209.
- ^ a b c d e f Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas (2015). "Precise radial velocities of giant stars". Astronomy & Astrophysics. 574: A116. arXiv:1412.4634. Bibcode:2015A&A...574A.116R. doi:10.1051/0004-6361/201322360. Vizier catalog entry
- ^ De Medeiros, J. R.; Mayor, M. (1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series. 139 (3): 433. arXiv:astro-ph/0608248. Bibcode:1999A&AS..139..433D. doi:10.1051/aas:1999401. Vizier catalog entry
- ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. Vizier catalog entry
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