74 Ophiuchi

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74 Ophiuchi
Ophiuchus constellation map.svg
Red circle.svg

Location of 74 Ophiuchi (circled)
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[1] mas
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
BD+03°3680, CCDM J18209+0323A, FK5 1476, GC 25036, HIP 89918, HR 6866, HD 168656, SAO 123377, WDS J18209+0323A
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[edit]

  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ a b c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971Freely accessible. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.  Vizier catalog entry
  3. ^ 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. 
  4. ^ 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
  5. ^ 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. 
  6. ^ 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:1412.4634Freely accessible. Bibcode:2015A&A...574A.116R. doi:10.1051/0004-6361/201322360.  Vizier catalog entry
  7. ^ 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. Bibcode:1999A&AS..139..433D. doi:10.1051/aas:1999401.  Vizier catalog entry
  8. ^ 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