Lambda Ophiuchi
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 16h 30m 54.8229s[1] |
| Declination | +01° 59′ 02.123″[1] |
| Apparent magnitude (V) | 3.90[2] |
| Characteristics | |
| Spectral type | A0V+[2] |
| U−B color index | +0.01[3] |
| B−V color index | +0.01[3] |
| Variable type | Suspected |
| Astrometry | |
| Radial velocity (Rv) | –13.5[4] km/s |
| Proper motion (μ) | RA: –31.37 mas/yr Dec.: –73.00 mas/yr |
| Parallax (π) | 19.63 ± 1.34 mas[1] |
| Distance | 170 ± 10 ly (51 ± 3 pc) |
| Details | |
| Rotational velocity (v sin i) | 138[5] km/s |
| Other designations | |
Lambda Ophiuchi (λ Ophiuchi, abbreviated Lambda Oph, λ Oph), also named Marfik,[6] is a binary star[7] in the constellation of Ophiuchus. It is approximately 166 light years from Earth.
Nomenclature
λ Ophiuchi (Latinised to Lambda Ophiuchi) is the system's Bayer designation.
It bore the traditional name Marfik (or Marsik), meaning "the elbow" in Arabic. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[8] to catalogue and standardize proper names for stars. The WGSN approved the name Marfik for this star on 12 September 2016 and it is now so entered in the IAU Catalog of Star Names.[6]
Properties
Lambda Ophiuchi belongs to spectral class A1V+A and has apparent magnitude +3.82.
References
- ^ a b c Perryman, M. A. C.; et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics. 323: L49–L52. Bibcode:1997A&A...323L..49P.
- ^ a b c "lam Oph -- Variable Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-06-08.
- ^ a b Johnson, H. L.; et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99). Bibcode:1966CoLPL...4...99J.
- ^ Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto: International Astronomical Union. Bibcode:1967IAUS...30...57E.
{{cite conference}}: Unknown parameter|booktitle=ignored (|book-title=suggested) (help); Unknown parameter|editors=ignored (|editor=suggested) (help) - ^ Royer, F.; Zorec, J.; Gómez, A. E. (February 2007). "Rotational velocities of A-type stars. III. Velocity distributions". Astronomy and Astrophysics. 463 (2): 671–682. arXiv:astro-ph/0610785. Bibcode:2007A&A...463..671R. doi:10.1051/0004-6361:20065224.
- ^ a b "IAU Catalog of Star Names". Retrieved 28 July 2016.
- ^ Lastennet, E.; Fernandes, J.; Lejeune, Th. (June 2002). "A revised HRD for individual components of binary systems from BaSeL BVRI synthetic photometry. Influence of interstellar extinction and stellar rotation". Astronomy and Astrophysics. 388: 309–319. arXiv:astro-ph/0203341. Bibcode:2002A&A...388..309L. doi:10.1051/0004-6361:20020439.
- ^ IAU Working Group on Star Names (WGSN), International Astronomical Union, retrieved 22 May 2016.
External links
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