- Lambda Ophiuchi
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Lambda Ophiuchi Observation data
Epoch J2000 Equinox J2000Constellation 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/yrParallax (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.
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.
External links
Bayer α (Rasalhague) • β (Cebalrai) • γ • δ (Yed Prior) • ε (Yed Posterior) • ζ (Han) • η (Sabik) • θ • ι • κ • λ (Marfik) • μ • ν • ξ • ο • ρ • σ • τ • υ • φ • χ • ψ • ω • b • c • d • e • f • p • AFlamsteed 1 (δ, Yed Prior) • 2 (ε, Yed Posterior) • 3 (υ) • 4 (ψ) • 5 (ρ) • 7 (χ) • 8 (φ) • 9 (ω) • 10 (λ, Marfik) • 12 • 13 (ζ, Han) • 14 • 15 • 16 • 18 • 19 • 20 • 21 • 23 • 24 • 25 (ι) • 26 • 27 (κ) • 28 • 29 • 30 • 31 • 35 (η, Sabik) • 36 (A) • 37 • 38 • 39 (ο) • 40 (ξ) • 41 • 42 (θ) • 43 • 44 (b) • 45 (d) • 47 • 49 (σ) • 50 • 51 (c) • 52 • 53 (f) • 54 • 55 (α, Rasalhague) • 57 (μ) • 58 • 60 (β, Cebalrai) • 61 • 62 (γ) • 64 (ν) • 66 • 67 • 68 • 69 (τ) • 70 (p) • 71 • 72 • 73 • 74 • 24 ScoNearby Barnard's Star • Wolf 1061 • 70 (p) • 36 (A) • Gliese 644/643 (Van Biesbroeck 8) • Gliese 673 • GJ 1207Categories:- Main sequence star stubs
- Ophiuchus constellation
- Bayer objects
- A-type main sequence stars
- Stars with proper names
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