49 Librae

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
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]
Spectral type F7 V[3]
U−B color index +0.03[2]
B−V color index +0.52[2]
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[1] mas
Distance115 ± 5 ly
(35 ± 2 pc)
Absolute magnitude (MV)2.89[4]
Surface gravity (log g)4.14[5] cgs
Temperature6,237[4] K
Metallicity [Fe/H]–0.02[4] dex
Rotational velocity (v sin i)10[4] km/s
Age12[6] Gyr
Other designations
49 Lib, BD–16 4196, FK5 1419, GJ 3931, HD 143333, HIP 78400, HR 5954, SAO 159625.[7]
Database references

49 Librae is the Flamsteed designation for a spectroscopic binary[8] 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.


  1. ^ 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.
  2. ^ 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.
  3. ^ 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.
  4. ^ a b c d e 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.
  5. ^ 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.
  6. ^ Fuhrmann, K.; Chini, R. (1 January 2017). "Bright Times for an Ancient Star". IOPscience. The Astrophysical Journal. p. 114. Bibcode:2017ApJ...834..114F. doi:10.3847/1538-4357/834/2/114. Retrieved 21 January 2017.
  7. ^ "49 Lib". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2013-11-06.
  8. ^ 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.

Coordinates: Sky map 16h 00m 19.594s, −16° 32′ 00.22″