Back Subra AST Subra Catalan HD83809 CE Subra (Stern) German Subra Spanish امیکرون شیر Persian Omicron Leonis French Omicron Leonis ID Omicron Leonis Italian しし座オミクロン星 Japanese
 Omicron Leonis is located to the lower far right on this map of the constellation. | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Leo |
| Right ascension | 09h 41m 09.03s |
| Declination | +09° 53' 32.30" |
| Apparent magnitude (V) | +3.52[1] |
| Characteristics | |
| Spectral type | F8-G0III + A7m[2] |
| U−B color index | 0.21[1] |
| B−V color index | 0.49[1] |
| Astrometry | |
| Proper motion (μ) | RA: -143.20[3] mas/yr Dec.: -37.20[3] mas/yr |
| Parallax (π) | 24.412 ± 0.081 mas[4] |
| Distance | 133.53±0.45 ly (40.96±0.14 pc)[4] |
| Absolute magnitude (MV) | +0.51[5] |
| Orbit[4] | |
| Primary | Aa |
| Companion | Ab |
| Period (P) | 14.498068(6) days |
| Semi-major axis (a) | 0.1834±0.0007 AU |
| Eccentricity (e) | 0.0007±0.0004 |
| Inclination (i) | 57.8±0.2° |
| Longitude of the node (Ω) | 191.6±0.1° |
| Periastron epoch (T) | 2450623.9(9) days |
| Argument of periastron (ω) (secondary) | 214±22° |
| Semi-amplitude (K1) (primary) | 54.75±0.02 km/s |
| Semi-amplitude (K2) (secondary) | 61.66±0.02 km/s |
| Details[4] | |
| ο Leo Aa | |
| Mass | 2.074±0.013 M☉ |
| Radius | 5.73±0.34 R☉ |
| Luminosity | 41.1+5.8 −5.1 L☉ |
| Temperature | 6,107±93 K |
| Metallicity [Fe/H] | 0.11±0.10 dex |
| Age | 800(estimate)[6] Myr |
| ο Leo Ab | |
| Mass | 1.841±0.011 M☉ |
| Radius | 2.43±0.35 R☉ |
| Luminosity | 17.8+5.7 −4.3 L☉ |
| Temperature | 7,600±200 K |
| Metallicity [Fe/H] | 0.11±0.10 dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
Omicron Leonis (ο Leonis, abbreviated Omicron Leo, ο Leo) is a multiple star system in the constellation of Leo, west of Regulus, some 130 light-years from the Sun, where it marks one of the lion's forepaws.
It consists of a binary pair, designated Omicron Leonis A and an optical companion, Omicron Leonis B.[7] A's two components are themselves designated Omicron Leonis Aa (officially named Subra /ˈsuːbrə/, the traditional name for the system)[8][9] and Ab.
- ^ a b c Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D.
- ^ Ginestet, N.; Carquillat, J. M. (2002). "Spectral Classification of the Hot Components of a Large Sample of Stars with Composite Spectra, and Implication for the Absolute Magnitudes of the Cool Supergiant Components". The Astrophysical Journal Supplement Series. 143 (2): 513. Bibcode:2002ApJS..143..513G. doi:10.1086/342942.
- ^ a b Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
- ^ a b c d Gallenne, A.; Mérand, A.; Kervella, P.; Graczyk, D.; Pietrzyński, G.; Gieren, W.; Pilecki, B. (2023-04-01). "The Araucaria project: High-precision orbital parallaxes and masses of binary stars. I. VLTI/GRAVITY observations of ten double-lined spectroscopic binaries". Astronomy and Astrophysics. 672: A119. arXiv:2302.12960. Bibcode:2023A&A...672A.119G. doi:10.1051/0004-6361/202245712. ISSN 0004-6361.
- ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ Hummel, C. A.; Carquillat, J. -M.; Ginestet, N.; Griffin, R. F.; Boden, A. F.; Hajian, A. R.; Mozurkewich, D.; Nordgren, T. E. (2001). "Orbital and Stellar Parameters of Omicron Leonis from Spectroscopy and Interferometry". The Astronomical Journal. 121 (3): 1623. Bibcode:2001AJ....121.1623H. doi:10.1086/319391. S2CID 120280239.
- ^ "Washington Double Star Catalog". United States Naval Observatory. Archived from the original on 14 February 2011. Retrieved 2 January 2018.
- ^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
- ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.