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Epsilon Leonis
	Location of ε Leonis (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Leo
Right ascension	09h 45m 51.07330s
Declination	23° 46′ 27.3208″
Apparent magnitude (V)	2.98
Characteristics
Spectral type	G1 II
U−B color index	+0.47
B−V color index	+0.808
Variable type	suspected
Astrometry
Radial velocity (Rv)	4.86 ± 0.33 km/s
Proper motion (μ)	RA: –45.61 mas/yr ; Dec.: –9.21 mas/yr
Parallax (π)	13.22 ± 0.15 mas
Distance	247 ± 3 ly ; (75.6 ± 0.9 pc)
Absolute magnitude (MV)	–1.49
Details
Mass	3.71±0.04 M☉
Radius	21.03+0.31; −0.32 R☉
Luminosity	282±13 L☉
Surface gravity (log g)	2.36±0.05 cgs
Temperature	5,314±17 K
Metallicity [Fe/H]	−0.03±0.11 dex
Rotational velocity (v sin i)	8.1 km/s
Age	210±0 Myr
Other designations
	Algenubi, Ras Elased Australis, ε Leo, 17 Leo, BD +24°2129, FK5 367, GC 13443, HD 84441, HIP 47908, HR 3873, SAO 81004
Database references
SIMBAD	data

Epsilon Leonis (ε Leo, ε Leonis) is the fifth-brightest star in the constellation Leo, consistent with its Bayer designation Epsilon. It is known as Algenubi or Ras Elased Australis. Both names mean "the southern star of the lion's head". Australis is Latin for "southern" and Genubi is Arabic for "south".

Properties

Epsilon Leonis has a stellar classification of G1 II, with the luminosity class of II indicating that, it has evolved into a bright giant. It is much larger and brighter than the Sun with a luminosity 282^[8] times and a radius 21 times solar.^[7] Consequently, its absolute magnitude is actually –1.49,^[6] making it one of the more luminous stars in the constellation, significantly more than Regulus. Its apparent brightness, though, is only 2.98.^[2] Given its distance of about 247 light-years (76 parsecs), the star is more than three times the distance from the Sun than Regulus. At this distance, the visual magnitude of Epsilon Leonis is reduced by 0.03 as a result of extinction caused by intervening gas and dust.^[6]

Epsilon Leonis exhibits the characteristics of a Cepheid-like variable, changing by an amplitude of 0.3 magnitude every few days.^[10]^[9] It has around four times the mass of the Sun and a projected rotational velocity of 8.1 km s⁻¹.^[4] Based upon its iron abundance, the metallicity of this star's outer atmosphere is only around 52% of the Sun's. That is, the abundance of elements other than hydrogen and helium is about half that in the Sun.^[4]

References

^ ^a ^b ^c ^d ^e van Leeuwen, Floor (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752v1, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600 Note: see VizieR catalogue I/311.
^ ^a ^b ^c Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J
^ "eps Leo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-05-10.
^ ^a ^b ^c ^d ^e Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209
^ 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.
^ ^a ^b ^c Takeda, Yoichi; Sato, Bun'ei; Murata, Daisuke (August 2008), "Stellar parameters and elemental abundances of late-G giants", Publications of the Astronomical Society of Japan, 60 (4): 781–802, arXiv:0805.2434, Bibcode:2008PASJ...60..781T, doi:10.1093/pasj/60.4.781, S2CID 16258166
^ ^a ^b ^c ^d Baines, Ellyn K.; et al. (2018), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal, 155 (1), 30, arXiv:1712.08109, Bibcode:2018AJ....155...30B, doi:10.3847/1538-3881/aa9d8b, S2CID 119427037.
^ ^a ^b ^c ^d ^e Soubiran, C.; Creevey, O. L.; Lagarde, N.; Brouillet, N.; Jofré, P.; Casamiquela, L.; Heiter, U.; Aguilera-Gómez, C.; Vitali, S.; Worley, C.; de Brito Silva, D. (2024-02-01), "Gaia FGK benchmark stars: Fundamental Teff and log g of the third version", Astronomy and Astrophysics, 682: A145, arXiv:2310.11302, Bibcode:2024A&A...682A.145S, doi:10.1051/0004-6361/202347136, ISSN 0004-6361 Epsilon Leonis' database entry at VizieR.
^ ^a ^b Kaler, James B., "ALGENUBI (Epsilon Leonis)", Stars, University of Illinois, retrieved 2010-05-10
^ Andrievsky, S. M. (July 1998), "BA II lines as luminosity indicators: s-Cepheids and non-variable supergiants", Astronomische Nachrichten, 319 (4): 239–240, Bibcode:1998AN....319..239A, doi:10.1002/asna.2123190405

[aaa474_2_653-1] van Leeuwen, Floor (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752v1, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600 Note: see VizieR catalogue I/311.

[clpl4_99-2] Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J

[SIMBAD-3] "eps Leo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-05-10.

[aj135_1_209-4] Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209

[gcvs-5] 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.

[pasj60_4_781-6] Takeda, Yoichi; Sato, Bun'ei; Murata, Daisuke (August 2008), "Stellar parameters and elemental abundances of late-G giants", Publications of the Astronomical Society of Japan, 60 (4): 781–802, arXiv:0805.2434, Bibcode:2008PASJ...60..781T, doi:10.1093/pasj/60.4.781, S2CID 16258166

[Baines2018-7] Baines, Ellyn K.; et al. (2018), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal, 155 (1), 30, arXiv:1712.08109, Bibcode:2018AJ....155...30B, doi:10.3847/1538-3881/aa9d8b, S2CID 119427037.

[Soubiran2024-8] Soubiran, C.; Creevey, O. L.; Lagarde, N.; Brouillet, N.; Jofré, P.; Casamiquela, L.; Heiter, U.; Aguilera-Gómez, C.; Vitali, S.; Worley, C.; de Brito Silva, D. (2024-02-01), "Gaia FGK benchmark stars: Fundamental Teff and log g of the third version", Astronomy and Astrophysics, 682: A145, arXiv:2310.11302, Bibcode:2024A&A...682A.145S, doi:10.1051/0004-6361/202347136, ISSN 0004-6361 Epsilon Leonis' database entry at VizieR.

[kaler-9] Kaler, James B., "ALGENUBI (Epsilon Leonis)", Stars, University of Illinois, retrieved 2010-05-10

[an319_4_239-10] Andrievsky, S. M. (July 1998), "BA II lines as luminosity indicators: s-Cepheids and non-variable supergiants", Astronomische Nachrichten, 319 (4): 239–240, Bibcode:1998AN....319..239A, doi:10.1002/asna.2123190405

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Epsilon Leonis

Properties

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References

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