Global InformationOmicron Leonis information
 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) | 25.03[3] ± 0.22 mas |
| Distance | 135 ly (41.4±0.1[4] pc) |
| Absolute magnitude (MV) | +0.51[5] |
| Orbit[4] | |
| Primary | Aa |
| Companion | Ab |
| Period (P) | 14.498064±0.000009 days |
| Semi-major axis (a) | 4.46±0.01 mas |
| Eccentricity (e) | 0 |
| Inclination (i) | 57.6±0.1° |
| Longitude of the node (Ω) | 191.4±0.1° |
| Periastron epoch (T) | TJD 10629.831±0.003 |
| Details[4] | |
| ο Leo Aa | |
| Mass | 2.12 M☉ |
| Radius | 5.9±0.5 R☉ |
| Luminosity | 39.4±2.4 L☉ |
| Temperature | 6,000±200 K |
| Age | 800(estimate) Myr |
| ο Leo Ab | |
| Mass | 1.87±0.01 M☉ |
| Radius | 2.2±0.3 R☉ |
| Luminosity | 15.4±1.0 L☉ |
| Temperature | 7,600±400 K |
| Other designations | |
Subra, ο Leo, 14 Leo, BD+10 2044, FK5 365, HD 83808/83809, HIP 47508, HR 3852, SAO 98709 | |
| 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.[6] A's two components are themselves designated Omicron Leonis Aa (officially named Subra /ˈsuːbrə/, the traditional name for the system)[7][8] 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 c 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 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.
- ^ 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.
- ^ "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.