Pi Leonis

Pi Leonis, Latinized from π Leonis, is a single[9] star in the zodiac constellation Leo. It is a red hued star that is visible to the naked eye with an apparent visual magnitude of 4.70.[2] This object is located at a distance of some 410 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +22 km/s.[4] Because the star lies near the ecliptic it is subject to occultations by the Moon.[10]

π Leonis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Leo
Right ascension 10h 00m 12.80589s[1]
Declination +08° 02′ 39.2032″[1]
Apparent magnitude (V) 4.70[2]
Characteristics
Spectral type M2 III[3]
U−B color index +1.88[2]
B−V color index +1.60[2]
Astrometry
Radial velocity (Rv)22.36±0.29[4] km/s
Proper motion (μ) RA: −31.41[1] mas/yr
Dec.: −22.15[1] mas/yr
Parallax (π)8.03 ± 0.29[1] mas
Distance410 ± 10 ly
(125 ± 4 pc)
Absolute magnitude (MV)−0.79[5]
Details
Radius70+6
−5[6] R☉
Luminosity1,077±73[6] L☉
Surface gravity (log g)2.95[7] cgs
Temperature3,956+158
−159[6] K
Metallicity [Fe/H]0.104[7] dex
Other designations
π Leo, 29 Leonis, BD+08°2301, HD 86663, HIP 49029, HR 3950, SAO 118044[8]
Database references
SIMBADdata

This is an evolved, red giant star with a stellar classification of M2 III.[3] With the supply of hydrogen at its core exhausted, it has expanded to 70 times the Sun's radius. The star shines with 1,077 times the luminosity of the Sun from an expanded outer atmosphere that has an effective temperature of 3,956 K.[6] According to the General Catalogue of Variable Stars, it is a suspected variable star with a maximum magnitude of 4.67.[11]

References
  1. van Leeuwen, F. (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. Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
  3. Morgan, W. W.; Keenan, P. C. (1973), "Spectral Classification", Annual Review of Astronomy and Astrophysics, 11: 29, Bibcode:1973ARA&A..11...29M, doi:10.1146/annurev.aa.11.090173.000333.
  4. Famaey, B.; et al. (2009), "Spectroscopic binaries among Hipparcos M giants,. I. Data, orbits, and intrinsic variations", Astronomy and Astrophysics, 498 (2): 627–640, arXiv:0901.0934, Bibcode:2009A&A...498..627F, doi:10.1051/0004-6361/200810698, S2CID 18739721.
  5. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  6. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  7. Tabernero, H. M.; Montes, D.; González Hernández, J. I. (November 2012), "Chemically tagging the Hyades Supercluster. A homogeneous sample of F6-K4 kinematically selected northern stars", Astronomy & Astrophysics, 547: 15, arXiv:1205.4879, Bibcode:2012A&A...547A..13T, doi:10.1051/0004-6361/201117506, S2CID 53327676, A13.
  8. "pi. Leo -- Variable Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-09-29.
  9. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  10. White, Nathaniel M.; Feierman, Barry H. (September 1987), "A Catalog of Stellar Angular Diameters Measured by Lunar Occultation", Astronomical Journal, 94: 751, Bibcode:1987AJ.....94..751W, doi:10.1086/114513.
  11. Samus, N. N.; Durlevich, O. V.; et al. (2007), Combined General Catalogue of Variable Stars (GCVS4.2), retrieved 2016-09-30. VizieR On-line Data Catalog: B/gcvs.
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