30 Ophiuchi

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30 Ophiuchi
Ophiuchus constellation map.svg
Red circle.svg

Location of 30 Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 17h 01m 03.60266s[1]
Declination −4° 13′ 21.5183″[1]
Apparent magnitude (V) 4.82[2]
Spectral type K4III[3]
U−B color index +1.80[4]
B−V color index +1.48[4]
Radial velocity (Rv) -6.70[5] km/s
Proper motion (μ) RA: -39.13[1] mas/yr
Dec.: -78.09[1] mas/yr
Parallax (π) 8.05 ± 0.33[1] mas
Distance 410 ± 20 ly
(124 ± 5 pc)
Absolute magnitude (MV) -0.65[2]
Luminosity 426[2] L
Surface gravity (log g) 1.73[6] cgs
Temperature 4,144[7] K
Metallicity [Fe/H] -0.03[2] dex
Rotational velocity (v sin i) 1.4[8] km/s
Other designations
BD-04°4215, CCDM J17011-0413A, FK5 1445, GC 22937, HIP 83262, HR 6318, HD 153687, NSV 8111, SAO 141483, WDS J17011-0413A
Database references

30 Ophiuchi is a class K4III[3] (orange giant) star in the constellation Ophiuchus. Its apparent magnitude is 4.82[2] and it is approximately 405 light years away based on parallax.[1]

The primary has two reported companions: B, at magnitude 9.71 and separation 99.8", and C, at magnitude 8.75 and separation 220.9".[9]


  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 d e 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. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  6. ^ Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. arXiv:1605.07384Freely accessible. Bibcode:2016A&A...591A.118S. doi:10.1051/0004-6361/201628497. 
  7. ^ McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society. 427: 343. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.  Vizier catalog entry
  8. ^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474Freely accessible. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762.  Vizier catalog entry
  9. ^ 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