49 Librae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Libra |
| Right ascension | 16h 00m 19.59408s[1] |
| Declination | –16° 32′ 00.2207″[1] |
| Apparent magnitude (V) | 5.47[2] |
| Characteristics | |
| Spectral type | F7 V[3] |
| U−B color index | +0.03[2] |
| B−V color index | +0.52[2] |
| Astrometry | |
| Radial velocity (Rv) | –20.1 ± 4.0[4] km/s |
| Proper motion (μ) | RA: –631.32[1] mas/yr Dec.: –417.38[1] mas/yr |
| Parallax (π) | 28.40 ± 1.23 mas[1] |
| Distance | 115 ± 5 ly (35 ± 2 pc) |
| Absolute magnitude (MV) | 2.89[4] |
| Details | |
| Surface gravity (log g) | 4.14[5] cgs |
| Temperature | 6,237[4] K |
| Metallicity [Fe/H] | –0.02[4] dex |
| Rotational velocity (v sin i) | 10[4] km/s |
| Age | 2.5[4] Gyr |
| Other designations | |
49 Librae is the Flamsteed designation for a spectroscopic binary[7] star system in the Zodiac constellation of Libra. It has an apparent visual magnitude of 5.47,[2] making it faintly visible to the naked eye from dark suburban skies. Measurements made with the Hipparcos spacecraft show an annual parallax shift of 0.02840″,[1] which is equivalent to a distance of roughly 115 ly (35 pc) from the Sun.
The combined spectrum of 49 Librae matches a stellar classification of F7 V,[3] with the luminosity class of V suggesting the primary forms a main sequence star like the Sun.
References
- ^ a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
- ^ a b c d Nicolet, B. (October 1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N.
- ^ a b Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637.
- ^ a b c d e f Nordström, B.; et al. (November 2007), "The Geneva-Copenhagen survey of the Solar neighbourhood. II. New uvby calibrations and rediscussion of stellar ages, the G dwarf problem, age-metallicity diagram, and heating mechanisms of the disk", Astronomy & Astrophysics, 475 (2): 519–537, arXiv:0707.1891, Bibcode:2007A&A...475..519H, doi:10.1051/0004-6361:20077221.
- ^ Balachandran, Suchitra (May 1, 1990), "Lithium depletion and rotation in main-sequence stars", Astrophysical Journal, Part 1, 354: 310–332, Bibcode:1990ApJ...354..310B, doi:10.1086/168691.
- ^ "49 Lib -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2013-11-06.
- ^ Abt, Helmut A. (January 2009), "MK Classifications of Spectroscopic Binaries", The Astrophysical Journal Supplement, 180 (1): 117–118, Bibcode:2009ApJS..180..117A, doi:10.1088/0067-0049/180/1/117.
