Gamma Leonis
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  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo |
| Richt ascension | 10h 19m 58.35056s[1] |
| Declination | +19° 50′ 29.3468″[1] |
| Apparent magnitude (V) | 2.08 (2.37/3.64)[2] |
| Chairactereestics | |
| Spectral type | K0III[3] + G7IIIb |
| U−B colour index | 1.00 |
| B−V colour index | 1.14 |
| Variable teep | suspected[4] |
| Astrometry | |
| Radial velocity (Rv) | –36.24 ± 0.18[5] km/s |
| Proper motion (μ) | RA: +304.30[1] mas/yr Dec.: –154.28[1] mas/yr |
| Parallax (π) | 25.07 ± 0.52[1] mas |
| Distance | 130 ± 3 ly (39.9 ± 0.8 pc) |
| Absolute magnitude (MV) | –0.27/+0.98[6] |
| Orbit[3][7] | |
| Period (P) | 510.3 yr |
| Semi-major axis (a) | 4.24″ |
| Eccentricity (e) | 0.845 |
| Inclination (i) | 76.0° |
| Longitude o the node (Ω) | 143.4° |
| Periastron epoch (T) | 1671.3 |
| Details | |
| γ Leo A | |
| Mass | 1.23[3] M☉ |
| Radius | 31.88[3] R☉ |
| Luminosity | 320[3] L☉ |
| Surface gravity (log g) | 2.35[6] cgs |
| Temperatur | 4,470[6] K |
| Metallicity [Fe/H] | –0.49 ± 0.12[6] dex |
| γ Leo B | |
| Radius | 10[citation needit] R☉ |
| Luminosity | 40[citation needit] L☉ |
| Surface gravity (log g) | 2.98[6] cgs |
| Temperatur | 4,980[6] K |
| Metallicity [Fe/H] | –0.52 ± 0.11[6] dex |
| Ither designations | |
| γ Leo A: γ1 Leonis, HD 89484, HR 4057, SAO 81298 | |
| γ Leo B: γ2 Leonis, HD 89485, HR 4058, SAO 81299 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
Gamma Leonis (γ Leonis, abbreviatit Gamma Leo, γ Leo), an aw named Algieba,[8] is a binar starn seestem in the constellation o Leo. In 2009, a planetar companion aroond the primar wis annoonced.
References[eedit | eedit soorce]
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (November 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.
- ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256.
- ↑ 3.0 3.1 3.2 3.3 3.4 Han, Inwoo; Lee, B. C.; Kim, K. M.; Mkrtichian, D. E.; Hatzes, A. P.; Valyavin, G. (2010). "Detection of a Planetary Companion around the giant star γ-1 Leonis". Astronomy and Astrophysics. 509: A24. arXiv:0911.0968 . Bibcode:2010A&A...509A..24H. doi:10.1051/0004-6361/200912536.
- ↑ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
- ↑ Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430: 165–186, arXiv:astro-ph/0409579 , Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527
- ↑ Mason; Hartkopf, William I.; Wycoff, Gary L.; Holdenried, Ellis R. (2006). "Speckle Interferometry at the US Naval Observatory. XII". The Astronomical Journal. 132 (5): 2219–2230. Bibcode:2006AJ....132.2219M. doi:10.1086/508231.
- ↑ "IAU Catalog of Star Names". Retrieved 28 July 2016.
