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ε Leporis

Location of ε Leporis (circled)
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Lepus
Right ascension	05 05 27.66537
Declination	–22° 22′ 15.7239″
Apparent magnitude (V)	+3.166
Characteristics
Spectral type	K4 III
U−B color index	+1.783
B−V color index	+1.478
Astrometry
Radial velocity (Rv)	+1.0 km/s
Proper motion (μ)	RA: +21.13 mas/yr Dec.: –73.11 mas/yr
Parallax (π)	15.5999 ± 0.1074 mas
Distance	209 ± 1 ly (64.1 ± 0.4 pc)
Absolute magnitude (MV)	–1.02 ± 0.10
Details
Mass	1.70±0.19 M☉
Radius	40.1±3.2 R☉
Luminosity	372 L☉
Surface gravity (log g)	1.43±0.09 cgs
Temperature	4,131 K
Metallicity	–0.02 dex
Age	1.72±0.47 Gyr
Other designations
ε Lep, 2 Leporis, NSV 1826, BD−22° 1000, FK5 186, HD 32887, HIP 23685, HR 1654, SAO 170051
Database references
SIMBAD	data

Epsilon Leporis, Latinized from ε Leporis, is a third-magnitude star in the southern constellation Lepus. The apparent visual magnitude of +3.166 places it third in brightness among the stars in this constellation. Based upon parallax measurements, it is located at a distance of around 213 light-years (65 parsecs) from Earth.

This is an evolved giant star with a stellar classification of K4 III that has expanded to 40 times the Sun's radius. It is about 1.72 billion years old and has 1.70 times the mass of the Sun, with a luminosity 372 times as great. The outer atmosphere is cooler than the Sun's with an effective temperature of 4,131 K, giving it the orange hue of a K-type star. In terms of its composition, this star shows a similar abundance of elements other than hydrogen and helium to the Sun.

The envelope of this star is undergoing oscillations that show up as changes in the star's radial velocity. Over long durations these follow a linear trend, in combination with shorter period oscillations occurring over a few days. These oscillations are unlikely to be the result of rotational module as that would imply a high rotation rate, which would display itself through strong X-ray emissions. Instead, they may be the result of solar-like and Mira-like oscillations.

References

1. ^ 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. S2CID 18759600.
2. ^ Gutierrez-Moreno, Adelina; et al. (1966), "A System of photometric standards", Publications of the Department of Astronomy University of Chile, 1, Publicaciones Universidad de Chile, Department de Astronomy: 1–17, Bibcode:1966PDAUC...1....1G
3. ^ Houk, Nancy; Smith-Moore, M. (1978), "Michigan catalogue of two-dimensional spectral types for the HD stars", Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
4. Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veröffentlichungen des Astronomischen Rechen-Instituts Heidelberg, 35 (35), Astronomisches Rechen-Institut Heidelberg: 1, Bibcode:1999VeARI..35....1W
5. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
6. ^ da Silva, L.; et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics, 458 (2): 609–623, arXiv:astro-ph/0608160, Bibcode:2006A&A...458..609D, doi:10.1051/0004-6361:20065105, S2CID 9341088.
7. ^ di Mauro, M. P.; Cardini, D. (October 2006), "Asteroseismology of K giants", in Fletcher, Karen; Thompson, Michael (eds.), Proceedings of SOHO 18/GONG 2006/HELAS I, Beyond the spherical Sun (ESA SP-624), vol. 624, Sheffield, UK, p. 118, Bibcode:2006ESASP.624E.118D{{citation}}: CS1 maint: location missing publisher (link)
8. "eps Lep". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2006-10-29.
9. "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on 2012-03-18, retrieved 2012-01-16
10. Setiawan, J.; et al. (2006), "Multi-periodic oscillations of HD 32887 and HD 81797", Memorie della Società Astronomica Italiana, 77: 510, arXiv:astro-ph/0505184, Bibcode:2006MmSAI..77..510S

v t e Constellation of Lepus
Lepus in Chinese astronomy List of star names in Lepus List of stars in Lepus
Stars	Bayer α (Arneb) β (Nihal) γ δ ε ζ η θ ι κ λ μ ν Flamsteed 1 8 10 12 17 19 4 Mon Variable R T RX AF AK HR 1621 1762 HD 31527 32450 32667 33142 33283 Other 2MASS J0523−1403 Gliese 229 TOI-421 WASP-49 WASP-61
Exoplanets HD 33283 b
Star clusters Messier 79
Nebulae Abell 7 IC 418
Galaxies	NGC 1964 1979 1993 2139 Other IRAS 06076-2139 PKS 0454-234
Category

• K-type giants
• Lepus (constellation)
• Bayer objects
• Durchmusterung objects
• Flamsteed objects
• Henry Draper Catalogue objects
• Hipparcos objects
• Bright Star Catalogue objects