38 Leonis Minoris

38 Leonis Minoris
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Leo Minor
Right ascension 10h 39m 07.63244s[1]
Declination +37° 54′ 36.0035″[1]
Apparent magnitude (V) 5.84[2]
Characteristics
Spectral type G0 IV[3]
B−V color index 0.595±0.003[2]
Astrometry
Radial velocity (Rv)+30.9±0.3[4] km/s
Proper motion (μ) RA: −220.50[1] mas/yr
Dec.: −45.31[1] mas/yr
Parallax (π)19.11 ± 0.37 mas[1]
Distance171 ± 3 ly
(52 ± 1 pc)
Absolute magnitude (MV)2.26[5]
Orbit[5]
Period (P)7.7991499±0.0000037 d
Eccentricity (e)0.023±0.034
Periastron epoch (T)20,165.164±1.470 HJD
Argument of periastron (ω)
(secondary)		285.56±68.51°
Semi-amplitude (K1)
(primary)		24.10±0.73 km/s
Details
38 LMi A
Mass1.68[6] M☉
Luminosity11.32[2] L☉
Surface gravity (log g)3.73[6] cgs
Temperature6,106[7] K
Metallicity [Fe/H]+0.32[7] dex
Rotational velocity (v sin i)14.5±1.0[5] km/s
Age2.03±0.14[7] Gyr
38 LMi B
Mass≥ 0.31[8] M☉
Other designations
38 LMi, BD+38° 2166, FK5 2852, HD 92168, HIP 52139, HR 4168, SAO 62178[9]
Database references
SIMBADdata

38 Leonis Minoris is a binary star[3] system in the northern constellation of Leo Minor. It shines with a combined light of apparent magnitude 5.84,[2] which indicates it a dimly visible to the naked eye under good viewing conditions. An annual parallax shift of 19.11[1] mas provides a distance estimate of around 171 light years. It has a relatively high proper motion, traversing the celestial sphere at a rate of 0.226 arcseconds per year,[10] and is moving away from the Sun with a radial velocity of +31 km/s.[4]

This is a single-lined spectroscopic binary[3] with an orbital period of 7.8 days and a low eccentricity of 0.023 – nearly circular.[5] The visible component has a stellar classification of G0 IV,[3] matching a G-type subgiant star that is exhausting the hydrogen at its core and evolving into a giant. It is about two[7] billion years old with 1.68[6] times the mass of the Sun and is spinning with a projected rotational velocity of 14.5 km/s.[5] The star has a higher than solar abundance of iron in its spectrum.[7] It is radiating 11[2] times the Sun's luminosity from its photosphere at an effective temperature of 6,106 K.[7]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference abt2009 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  5. ^ a b c d e Cite error: The named reference Willmarth2016 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Casagrande2011 was invoked but never defined (see the help page).
  7. ^ a b c d e f Cite error: The named reference Pace2013 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Tokovinin2006 was invoked but never defined (see the help page).
  9. ^ "38 LMi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-20.
  10. ^ Cite error: The named reference Lepine2005 was invoked but never defined (see the help page).