Gamma Leonis

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γ Leonis
Leo constellation map.svg
Red circle.svg
Location o γ Leonis (circled)
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]
Spectral type K0III[3] + G7IIIb
U−B colour index 1.00
B−V colour index 1.14
Variable teep suspected[4]
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
Distance130 ± 3 ly
(39.9 ± 0.8 pc)
Absolute magnitude (MV)–0.27/+0.98[6]
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
γ Leo A
Mass1.23[3] M
Radius31.88[3] R
Luminosity320[3] L
Surface gravity (log g)2.35[6] cgs
Temperatur4,470[6] K
Metallicity [Fe/H]–0.49 ± 0.12[6] dex
γ Leo B
Radius10[citation needit] R
Luminosity40[citation needit] L
Surface gravity (log g)2.98[6] cgs
Temperatur4,980[6] K
Metallicity [Fe/H]–0.52 ± 0.11[6] dex
Ither designations
Algieba, γ Leonis, 41 Leo, BD +20°2467, GCTP 2423.00, HIP 50583, NSV 4823, LTT 12764/12765, WDS 10200+1950.
γ Leo A: γ1 Leonis, HD 89484, HR 4057, SAO 81298
γ Leo B: γ2 Leonis, HD 89485, HR 4058, SAO 81299
Database references
Exoplanet Archivedata
Extrasolar Planets

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. 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:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. 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. 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:0911.0968Freely accessible. Bibcode:2010A&A...509A..24H. doi:10.1051/0004-6361/200912536. 
  4. 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. 
  5. 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/0409579Freely accessible, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272 
  6. 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 
  7. 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. 
  8. "IAU Catalog of Star Names". Retrieved 28 July 2016. 

Coordinates: Sky map 10h 19m 58.3s, +19° 50′ 30″