Star in the constellation Leo
Pi Leonis ,Latinised fromπ Leonis , is a single[ 11] star in thezodiac constellation Leo . It is a red-hued star that is visible to the naked eye with anapparent visual magnitude of 4.70.[ 2] light-years from theSun based onparallax , and is drifting further away with aradial velocity of +22 km/s.[ 5] ecliptic it is subject tooccultations by theMoon .[ 12]
This is anevolved ,red giant star with astellar classification of M2 III.[ 4] core exhausted, it has expanded to 70 times theSun's radius . The star shines with 1,077 times theluminosity of the Sun from an expandedouter atmosphere that has aneffective temperature ofK General Catalogue of Variable Stars variable star with a maximum magnitude of 4.67.[ 13]
^a b c d e 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 . ^a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)",Catalogue of Eggen's UBV Data ,SIMBAD ,Bibcode :1986EgUBV........0M . ^ Eggen, Olin J. (1992), "Asymptotic Giant Branch Stars Near the Sun",The Astronomical Journal ,104 : 275,Bibcode :1992AJ....104..275E ,doi :10.1086/116239 . ^a b 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 . ^a b 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 . ^ 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 . ^a b Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022), "Stellar and substellar companions from Gaia EDR3. Proper-motion anomaly and resolved common proper-motion pairs",Astronomy and Astrophysics ,657 : 657,arXiv :2109.10912 Bibcode :2022A&A...657A...7K ,doi :10.1051/0004-6361/202142146 ,S2CID 237605138 . ^ 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 atVizieR .^a b c Cardiel, Nicolás; Zamorano, Jaime; Bará, Salvador; Sánchez De Miguel, Alejandro; Cabello, Cristina; Gallego, Jesús; García, Lucía; González, Rafael; Izquierdo, Jaime; Pascual, Sergio; Robles, José; Sánchez, Ainhoa; Tapia, Carlos (2021), "Synthetic RGB photometry of bright stars: Definition of the standard photometric system and UCM library of spectrophotometric spectra",Monthly Notices of the Royal Astronomical Society ,504 (3): 3730,arXiv :2103.17009 Bibcode :2021MNRAS.504.3730C ,doi :10.1093/mnras/stab997 ^ "pi. Leo -- Variable Star" ,SIMBAD Astronomical Database , Centre de Données astronomiques de Strasbourg, retrieved2016-09-29 .^ 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 . ^ 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 . ^ Samus, N. N.; Durlevich, O. V.; et al. (2007),Combined General Catalogue of Variable Stars (GCVS4.2) , retrieved2016-09-30 . B/gcvs .
