Sigma Ophiuchi

σ Ophiuchi


Location of σ Ophiuchi (circled)

Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 17h 26m 30.88004s[1]
Declination 4° 08′ 25.2940″[1]
Apparent magnitude (V) 4.31[2] (4.25 - 4.51[3])
Characteristics
Spectral type K2III[4]
U−B color index +1.57[2]
B−V color index +1.51[2]
Variable type suspected[3]
Astrometry
Radial velocity (Rv)-27.81[5] km/s
Proper motion (μ) RA: +0.72[1] mas/yr
Dec.: +7.03[1] mas/yr
Parallax (π)3.62 ± 0.29[1] mas
Distance900 ± 70 ly
(280 ± 20 pc)
Absolute magnitude (MV)-2.85[6]
Details
Mass4.87[7] M☉
Radius73.25[7] R☉
Luminosity2047[7] L☉
Surface gravity (log g)1.52[8] cgs
Temperature4,540[7] K
Metallicity [Fe/H]-0.07[7] dex
Rotational velocity (v sin i)4.2[9] km/s
Other designations
BD+04°3422, 49 Ophiuchi, FK5 1459, GC 23621, HIP 85355, HR 6498, HD 157999, NSV 8664, SAO 122387
Database references
SIMBADdata

Sigma Ophiuchi (σ Oph) is a class K2III[4] (orange giant) star in the constellation Ophiuchus. Its apparent magnitude is 4.31[2] and it is approximately 900 light years away based on parallax.[1]

References

  1. 1 2 3 4 5 6 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. 1 2 3 4 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. 1 2 Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  4. 1 2 Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 05: 0. Bibcode:1999MSS...C05....0H.
  5. ↑ Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data". Astronomy & Astrophysics. 430: 165. arXiv:astro-ph/0409579Freely accessible. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272.
  6. ↑ 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
  7. 1 2 3 4 5 Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas (2015). "Precise radial velocities of giant stars". Astronomy & Astrophysics. 574: A116. arXiv:1412.4634Freely accessible. Bibcode:2015A&A...574A.116R. doi:10.1051/0004-6361/201322360. Vizier catalog entry
  8. ↑ Hekker, S.; Meléndez, J. (2007). "Precise radial velocities of giant stars". Astronomy and Astrophysics. 475 (3): 1003. arXiv:0709.1145Freely accessible. Bibcode:2007A&A...475.1003H. doi:10.1051/0004-6361:20078233.
  9. ↑ De Medeiros, J. R.; Mayor, M. (1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series. 139 (3): 433. Bibcode:1999A&AS..139..433D. doi:10.1051/aas:1999401. Vizier catalog entry


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