41 Ophiuchi

41 Ophiuchi
Location of 41 Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 17h 16m 36.687s[1]
Declination 0° 26′ 43.15″[1]
Apparent magnitude (V) 4.72[2]
(4.92 / 7.51)[3]
Characteristics
Spectral type K2III[4]
U−B color index +1.11[5]
B−V color index +1.15[5]
Astrometry
Radial velocity (Rv)-0.16[6] km/s
Proper motion (μ) RA: -31.46[7] mas/yr
Dec.: -63.13[7] mas/yr
Parallax (π)15.85 ± 0.57[7] mas
Distance206 ± 7 ly
(63 ± 2 pc)
Absolute magnitude (MV)0.72[2]
Orbit[3]
Period (P)140.76 ± 0.23 yr
Semi-major axis (a)0.959 ± 0.008″
Eccentricity (e)0.866 ± 0.003
Inclination (i)65.1 ± 0.0°
Longitude of the node (Ω)220.5 ± 0.0°
Periastron epoch (T)B 1890.53 ± 0.36
Argument of periastron (ω)
(secondary)		287.5 ± 0.0°
Details
Mass1.60[8] M☉
Radius13[8] R☉
Luminosity69.92[2] L☉
Surface gravity (log g)2.42[8] cgs
Temperature4,571[8] K
Metallicity [Fe/H]+0.06[2] dex
Rotational velocity (v sin i)< 1.0[9] km/s
Other designations
BD-00°3255, CCDM J17166-0027AB, GC 23320, HIP 84514, HR 6415, HD 156266, SAO 141586, WDS J17166-0027AB
Database references
SIMBADdata

41 Ophiuchi is a class K2III[4] (orange giant) star in the constellation Ophiuchus. Its apparent magnitude is 4.72[2] and it is approximately 206 light years away based on parallax.[7]

A binary star, it has one companion, B, with magnitude 7.51 and a period of 206.3 years and eccentricity 0.55.[10][11]

References

  1. 1 2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H.
  2. 1 2 3 4 5 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
  3. 1 2 "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 28 May 2017.
  4. 1 2 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.
  5. 1 2 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
  6. ↑ 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.
  7. 1 2 3 4 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
  8. 1 2 3 4 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/9911002. Bibcode:1999A&A...352..555A. Vizier catalog entry
  9. ↑ 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:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. Vizier catalog entry
  10. ↑ Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (2012). "Dynamical masses of a selected sample of orbital binaries". Astronomy & Astrophysics. 546: A69. Bibcode:2012A&A...546A..69M. doi:10.1051/0004-6361/201219774. Vizier catalog entry
  11. ↑ 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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