Lambda Ophiuchi
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| 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[1] mas |
| Distance | 170 ± 10 ly (51 ± 3 pc) |
| Details | |
| Rotational velocity (v sin i) | 138[5] km/s |
| Other designations | |
Lambda Ophiuchi (λ Oph, λ Ophiuchi) is a binary star[6] system in the constellation Ophiuchus. It has the traditional name Marfik (or "Marsik").
Lambda Ophiuchi belongs to spectral class A1V+A and has apparent magnitude +3.82. It is approximately 166 light years from Earth.
[edit] 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. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=lam+Oph&submit=SIMBAD+search. 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". In Batten, Alan Henry; Heard, John Frederick. Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto: International Astronomical Union. Bibcode 1967IAUS...30...57E.
- ^ 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.
- ^ 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.
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