Iota Ophiuchi

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ι Ophiuchi
Ophiuchus constellation map.svg
Red circle.svg

Location of ι Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 16h 54m 00.47151s[1]
Declination 10° 09′ 55.2982″[1]
Apparent magnitude (V) 4.39[2]
Spectral type B8V[3]
U−B color index -0.32[4]
B−V color index -0.08[4]
Radial velocity (Rv) -19.00[5] km/s
Proper motion (μ) RA: -53.80[1] mas/yr
Dec.: -34.04[1] mas/yr
Parallax (π) 13.30 ± 0.22[1] mas
Distance 245 ± 4 ly
(75 ± 1 pc)
Absolute magnitude (MV) 0.01[2]
Mass 3.14[6] M
Radius 2.8[7] R
Luminosity 140[6] L
Surface gravity (log g) 4.03[8] cgs
Temperature 11,220[6] K
Metallicity [Fe/H] +0.09[8] dex
Rotational velocity (v sin i) 124[6] km/s
Other designations
BD+10°3092, 25 Ophiuchi, FK5 1442, GC 22775, HIP 82673, HR 6281, HD 152614, SAO 102458
Database references

Iota Ophiuchi (ι Oph) is a class B8V[3] (blue main-sequence) star in the constellation Ophiuchus. Its apparent magnitude is 4.39[2] and it is approximately 245 light years away based on parallax.[1]


  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. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. arXiv:1606.08053Freely accessible. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  6. ^ a b c d Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052Freely accessible. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691.  Vizier catalog entry
  7. ^ Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555. arXiv:astro-ph/9911002Freely accessible. Bibcode:1999A&A...352..555A.  Vizier catalog entry
  8. ^ a b Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv:1009.1491Freely accessible. Bibcode:2011A&A...525A..71W. doi:10.1051/0004-6361/201015014.