41 Ophiuchi
  | |
| 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 mas[7] |
| Distance | 206 ± 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 | |
| Mass | 1.60[8] M☉ |
| Radius | 13[8] R☉ |
| Luminosity | 69.92[2] L☉ |
| Surface gravity (log g) | 2.42[8] cgs |
| Temperature | 4,571[8] K |
| Metallicity [Fe/H] | +0.06[2] dex |
| Rotational velocity (v sin i) | < 1.0[9] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
- ^ a b 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.
- ^ a b c d e 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
- ^ a b "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 28 May 2017.
- ^ 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.
- ^ 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
- ^ 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.
- ^ a b c d 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
- ^ 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/9911002. Bibcode:1999A&A...352..555A. Vizier catalog entry
- ^ 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
- ^ 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
- ^ 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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