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Star in the constellation Leo Minor From Wikipedia, the free encyclopedia
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]
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] |
Distance | 171 ± 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 | |
Mass | 1.68[6] M☉ |
Luminosity | 11.32[2] L☉ |
Surface gravity (log g) | 3.73[6] cgs |
Temperature | 6,106[7] K |
Metallicity [Fe/H] | +0.32[7] dex |
Rotational velocity (v sin i) | 14.5±1.0[5] km/s |
Age | 2.03±0.14[7] Gyr |
38 LMi B | |
Mass | ≥ 0.31[8] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
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]
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