Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Leo |
Right ascension | 11h 00m 33.64811s [1] |
Declination | +03° 37′ 02.9766″ [1] |
Apparent magnitude (V) | 4.852 [2] |
Characteristics | |
Spectral type | K0.5 III Fe-0.5 [3] |
B−V color index | 1.163 [2] |
Astrometry | |
Radial velocity (Rv) | +5.98 [2] km/s |
Proper motion (μ) |
RA: +14.82
[1]
mas/
yr Dec.: −16.51 [1] mas/ yr |
Parallax (π) | 9.05 ± 0.20 mas [1] |
Distance | 360 ± 8
ly (110 ± 2 pc) |
Absolute magnitude (MV) | −1.04 [4] |
Details | |
Mass | 1.89 [2] M☉ |
Luminosity | 182 [2] L☉ |
Surface gravity (log g) | 1.8 [4] cgs |
Temperature | 4,519±52 [2] K |
Metallicity [Fe/H] | −0.16±0.10 [4] dex |
Age | 1.69 [2] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
58 Leonis is a possible binary star [6] system in the southern part of the constellation of Leo, near the border with Sextans. It shines with an apparent magnitude of 4.85, [2] making it bright enough to be seen with the naked eye. An annual parallax shift of 9.05±0.20 mas yields a distance estimate of 360 light years. It is moving further from the Sun with a heliocentric radial velocity of +6 km/s. [2]
This orange hued star is an evolved K-type giant with a stellar classification of K0.5 III Fe-0.5, [3] indicating a mild underabundance of iron in its spectrum. It was identified as a barium star by P. M. Williams (1971). [7] These are theorized to be stars that show an enrichment of s-process elements by mass transfer from a now- white dwarf companion when it passed through the asymptotic giant branch stage. [8] MacConnell et al. (1972) classified 58 Leonis as a marginal barium star. [4] De Castro et al. (2016) consider this to be only a probable barium star, because of the low degree of s-process enrichment, and they rejected it from their sample. Rather than having an evolved companion, it may instead have formed from a cloud that was mildly enriched with s-process elements. [4]