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Leo constellation map.svg
Location o Regulus in Leo
Observation data
Epoch J2000      Equinox J2000
Constellation Leo
Richt ascension A: 10h 08m 22.311s[1]
BC: 10h 08m 12.8/14s[2]
Declination A: +11° 58′ 01.95″[1]
BC: +11° 59′ 48″[2]
Apparent magnitude (V) 1.40[3]/8.13[4]/13.50[4]
Evolutionar stage Main sequence
Spectral type B8 IVn[3] + K2 V[5] + M4 V[5]
U−B colour index –0.36/+0.51[6]
B−V colour index –0.11/+0.86[6]
Variable teep Suspected[7]
Radial velocity (Rv)+5.9/+6.3[8] km/s
Proper motion (μ) RA: -248.73 ± 0.35[1] mas/yr
Dec.: 5.59 ± 0.21[1] mas/yr
Parallax (π)41.13 ± 0.35[1] mas
Distance79.3 ± 0.7 ly
(24.3 ± 0.2 pc)
Absolute magnitude (MV)–0.52/6.3/11.6
α Leo A
Mass3.8[9] M
Radius3.092 ± 0.147[3] R
Luminosity288[9] L
Surface gravity (log g)3.54 ± 0.09[10] cgs
Temperatur12,460 ± 200[9] K
Rotational velocity (v sin i)347[11] km/s
Age≳1[12] Gyr
α Leo B/C
Mass0.8[13]/0.3[4] M
Radius0.5[citation needit]/? R
Luminosity0.50[13]/? L
Surface gravity (log g)4.4[13]/? cgs
Temperatur4885[13]/? K
Ither designations
Alpha Leonis, 32 Leo, Cor Leonis, Aminous Basilicus, Lion’s Heart, Rex, Kalb al Asad, Kabeleced, FK5 380, GCTP 2384.00, GJ 9316, HIP 49669, HR 3982.
α Leo A: BD+12 2149, HD 87901, LTT 12716, SAO 98967.
α Leo B/C: BD+12 2147, HD 87884, LTT 12714, SAO 98966.
Database references

Regulus (α Leo, α Leonis, Alpha Leonis) is the brichtest starn in the constellation Leo an ane o the brichtest starns in the nicht sky, lyin approximately 79 licht years frae Yird.[1]

References[eedit | eedit soorce]

  1. 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (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.  Vizier catalog entry
  2. 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H. 
  3. 3.0 3.1 3.2 van Belle, Gerard T.; von Braun, Kaspar (2009). "Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars". The Astrophysical Journal. 694 (2): 1085–1098. arXiv:0901.1206Freely accessible. Bibcode:2009ApJ...694.1085V. doi:10.1088/0004-637X/694/2/1085. 
  4. 4.0 4.1 4.2 Tokovinin, A. A. (1997). "MSC - a catalogue of physical multiple stars". Astronomy and Astrophysics Supplement Series. 124: 75–84. Bibcode:1997A&AS..124...75T. doi:10.1051/aas:1997181. 
  5. 5.0 5.1 Gies, D.R.; Dieterich, S.; Richardson, N. D.; Riedel, A. R.; Team, B. L.; McAlister, H. A.; Bagnuolo, Jr., W. G.; Grundstrom, E. D.; Štefl, S.; Rivinius, Th.; Baade, D.; et al. (2008). "A Spectroscopic Orbit for Regulus". The Astrophysical Journal. 682 (2): L117–L120. arXiv:0806.3473Freely accessible. Bibcode:2008ApJ...682L.117G. doi:10.1086/591148. 
  6. 6.0 6.1 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. 
  7. 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: 02025. Bibcode:2009yCat....102025S. 
  8. Evans, D. S. (1967). "The Revision of the General Catalogue of Radial Velocities". Determination of Radial Velocities and their Applications. 30: 57. Bibcode:1967IAUS...30...57E. 
  9. 9.0 9.1 9.2 Malagnini, M. L.; Morossi, C. (November 1990), "Accurate absolute luminosities, effective temperatures, radii, masses and surface gravities for a selected sample of field stars", Astronomy and Astrophysics Supplement Series, 85 (3): 1015–1019, Bibcode:1990A&AS...85.1015M. 
  10. Fitzpatrick, E. L.; Massa, D. (March 2005), "Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry", The Astronomical Journal, 129 (3): 1642–1662, arXiv:astro-ph/0412542Freely accessible, Bibcode:2005AJ....129.1642F, doi:10.1086/427855. 
  11. Zorec, J.; Royer, F. (January 2012), "Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052Freely accessible, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691. 
  12. Rappaport, S.; Podsiadlowski, Ph.; Horev, I. (2009). "The Past and Future History of Regulus". The Astrophysical Journal. 698 (1): 666–675. arXiv:0904.0395Freely accessible. Bibcode:2009ApJ...698..666R. doi:10.1088/0004-637X/698/1/666. 
  13. 13.0 13.1 13.2 13.3 Martin, E. L.; Magazzu, A.; Rebolo, R. (1992). "On the post-T-Tauri nature of late-type visual companions to B-type stars". Astronomy and Astrophysics. 257: 186. Bibcode:1992A&A...257..186M. 

Coordinates: Sky map 10h 08m 22.3s, +11° 58′ 02″