45 Ophiuchi

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45 Ophiuchi
Ophiuchus constellation map.svg
Red circle.svg
Location of 45 Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 17h 27m 21.27571s[1]
Declination −29° 52′ 01.3262″[1]
Apparent magnitude (V) 4.28[2]
Spectral type F5III-IV[3]
U−B color index +0.11[4]
B−V color index +0.40[4]
Radial velocity (Rv)+38.00[5] km/s
Proper motion (μ) RA: +17.08[1] mas/yr
Dec.: -138.02[1] mas/yr
Parallax (π)29.23 ± 0.20[1] mas
Distance111.6 ± 0.8 ly
(34.2 ± 0.2 pc)
Absolute magnitude (MV)1.61[2]
Mass1.71[6] M
Radius3.2[6] R
Luminosity19.07[2] L
Surface gravity (log g)3.67[6] cgs
Temperature6,761[6] K
Metallicity [Fe/H]+0.03[2] dex
Rotational velocity (v sin i)65.4[7] km/s
Other designations
d Ophiuchi, CD-29 13557, FK5 646, GC 23627, HIP 85423, HR 6492, HD 157919, SAO 185412
Database references

45 Ophiuchi is a class F5III-IV[3] (yellow-white giant) star in the constellation Ophiuchus. Its apparent magnitude is 4.28[2] and it is approximately 111.6 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 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 Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample". The Astronomical Journal. 132: 161. arXiv:astro-ph/0603770Freely accessible. Bibcode:2006AJ....132..161G. doi:10.1086/504637. 
  4. ^ a b Mermilliod, J. C. (2006). "VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally published in: Institut d'Astronomie. 2168. Bibcode:2006yCat.2168....0M. 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 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
  7. ^ 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