37 Librae

37 Librae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Libra
Right ascension 15h 34m 10.70209s[1]
Declination −10° 03′ 52.3063″[1]
Apparent magnitude (V) 4.61[2]
Characteristics
Evolutionary stage subgiant[3]
Spectral type K1III–IV[4]
B−V color index 1.00±0.03[2]
Astrometry
Radial velocity (Rv)+49.25±0.08[5] km/s
Proper motion (μ) RA: +307.63[1] mas/yr
Dec.: −234.51[1] mas/yr
Parallax (π)34.57 ± 0.22 mas[1]
Distance94.3 ± 0.6 ly
(28.9 ± 0.2 pc)
Absolute magnitude (MV)2.30[2]
Details[5]
Mass1.38±0.10 M☉
Radius5.133±0.043[6] R☉
Luminosity12.71±0.69[6] L☉
Surface gravity (log g)3.19±0.06 cgs
Temperature4,809±62[6] K
Metallicity [Fe/H]0.02±0.04 dex
Rotational velocity (v sin i)2.02±0.33 km/s
Age3.39±0.80 Gyr
Other designations
37 Lib, BD−09°4171, FK5 1409, GC 20914, HD 138716, HIP 76219, HR 5777, SAO 140609[7]
Database references
SIMBADdata

37 Librae is a single[8] star in the southern zodiac constellation of Libra. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.61.[2] The star is located 94 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +49 km/s.[5]

This is an evolving subgiant star[3] with a stellar classification of K1 III–IV,[4] where the luminosity class indicates the spectrum displays blended traits of a subgiant and a giant star. It is an estimated 3.4 billion years old with 1.4 times the mass of the Sun.[5] Having the supply of hydrogen at its core all but exhausted, the star is starting to expand; currently it has five times the girth of the Sun. It is radiating 12.7 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,809 K.[6] At this temperature, 37 Librae glows with the hue of a K-type star.[9]

  1. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Snowden2005 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference jofre2015 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Rains2020 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference csiro was invoked but never defined (see the help page).