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Epsilon Leporis, Latinized from ε Leporis, formally named Ping,[9] is a third-magnitude star in the southern constellation Lepus. The apparent visual magnitude of +3.166[2] 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.[1]

This is an evolved giant star with a stellar classification of K4 III[3] 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[7] times as great. The outer atmosphere is cooler than the Sun’s with an effective temperature of 4,131 K,[6] giving it the orange hue of a K-type star.[10] In terms of its composition, this star shows a similar abundance of elements other than hydrogen and helium to the Sun.[6]

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.[11]

Nomenclature

Epsilon Leporis, Latinized from ε Leporis, is the star’s Bayer designation.

In Chinese astronomy, ε Leporis forms with μ Leporis the asterism Ping (屏), representing a screen in front of a toilet.[12] The IAU Working Group on Star Names approved the name Ping for ε Leporis on 22 March 2026.[9]

References

  1. ^ a b c d e 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. ^ a b c d 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. ^ a b 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. ^ a b c d 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. ^ a b 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. ^ a b “IAU Catalog of Star Names”. Retrieved 23 March 2026.
  10. ^ “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
  11. ^ 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
  12. ^ Ridpath, Ian. “Star Tales – Lepus”. Retrieved 23 March 2026.