| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo |
| Right ascension | 11h00m 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 | |
58 Leo, BD+04° 2407, FK5 1284, HD 95345, HIP 53807, HR 4291, SAO 118610, CCDM J11006+0337AB[5] | |
| 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 shiftof9.05±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 classificationofK0.5 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]
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