G-type giant in the constellation Leo Minor
7 Leonis Minoris Location of 7 LMi on the map (circled)
Observation dataEpoch J2000 Equinox J2000 Constellation Leo Minor Right ascension 09h 30m 43.22705s [ 1] Declination +33° 39′ 20.5700″[ 1] Apparent magnitude (V)5.86± 0.01[ 2] Characteristics Evolutionary stage horizontal branch [ 3] Spectral type G9 III[ 4] B−Vcolor index +1.05[ 5] Astrometry Radial velocity (Rv )1.7± 0.9[ 6] km/s Proper motion (μ)RA: −23.939mas /yr [ 1] Dec.: −48.160mas /yr [ 1] Parallax (π)7.0542± 0.1338 mas [ 1] Distance 462 ± 9 ly pc ) Absolute magnitude (MV )−0.03[ 7] Details Mass 2.74+0.24 −0.25 [ 3] M ☉ Radius 13.41± 0.68[ 8] R ☉ Luminosity 96.0+3.3 −3.6 [ 1] L ☉ Surface gravity (log g )2.49+0.07 −0.06 [ 3] cgs Temperature 4,923± 122[ 9] K Metallicity [Fe/H] −0.03± 0.10[ 10] dex Rotational velocity (v sin i )0.24[ 11] Age 575+201 −139 [ 3] Myr Other designations 7 LMi ,AG +33°953BD +34°1999FK5 2755GC 13112HD 82087HIP 46652HR 3764SAO 61529CCDM J09307+3339AWDS J09307+3339ATIC 8855140[ 12] Database references SIMBAD data
7 Leonis Minoris (7 LMi) is astar located in the northernconstellation Leo Minor . It is also designated asHD 82087 andHR 3764 . 7 LMi is faintly visible to thenaked eye as a yellow-hued point of light with anapparent magnitude of 5.86.[ 2] Gaia DR3 parallax measurements imply a distance of 462light-years [ 1] radial velocity ofkm/s [ 6] magnitudes due tointerstellar extinction [ 13] absolute magnitude of −0.03.[ 7]
There have been disagreements on the object'sstellar classification . 7 LMi is either aG-type giant star with a class of either G8 or G9 III,[ 4] K-type giant with a class of K0 III.[ 14] horizontal branch (95% fit),[ 3] helium fusion at itscore . It has 2.74 times themass of the Sun but at the age of 575million years ,[ 3] radius of the Sun .[ 8] luminosity of the Sun [ 1] photosphere at aneffective temperature ofK [ 9] metallicity at [Fe/H] = −0.03[ 10] projected rotational velocity ofkm/s [ 11]
7 LMi has two visual companions. AG +33°954 is a background star located much farther away than 7 LMi[ 15] spectroscopic binary itself.[ 16]
^a b c d e f g Vallenari, A.; et al. (Gaia collaboration) (2023)."Gaia Data Release 3. Summary of the content and survey properties" .Astronomy and Astrophysics .674 : A1.arXiv :2208.00211 Bibcode :2023A&A...674A...1G .doi :10.1051/0004-6361/202243940 S2CID 244398875 . Gaia DR3 record for this source atVizieR .^a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars".Astronomy and Astrophysics .355 :L27– L30.Bibcode :2000A&A...355L..27H .ISSN 0004-6361 .S2CID 17128864 . ^a b c d e f Stock, Stephan; Reffert, Sabine; Quirrenbach, Andreas (August 2018)."Precise radial velocities of giant stars: X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search" .Astronomy & Astrophysics .616 : A33.arXiv :1805.04094 Bibcode :2018A&A...616A..33S .doi :10.1051/0004-6361/201833111 ISSN 0004-6361 .S2CID 247657118 . ^a b c d Abt, H. A. (May 1986). "The ages and dimensions of Trapezium systems".The Astrophysical Journal .304 . American Astronomical Society: 688.Bibcode :1986ApJ...304..688A .doi :10.1086/164207 .ISSN 0004-637X .S2CID 121295060 . ^ Haggkvist, L.; Oja, T. (1970). "Results of BV photometry 1969-70 (Uppsala refractor)".Private Communication .Bibcode :1970Priv.........0H .S2CID 231475662 . ^a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system".Astronomy Letters .32 (11):759– 771.arXiv :1606.08053 Bibcode :2006AstL...32..759G .doi :10.1134/S1063773706110065 .eISSN 1562-6873 .ISSN 1063-7737 .S2CID 119231169 . ^a b Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation".Astronomy Letters .38 (5):331– 346.arXiv :1108.4971 Bibcode :2012AstL...38..331A .doi :10.1134/S1063773712050015 .eISSN 1562-6873 .ISSN 1063-7737 .S2CID 119257644 . ^a b Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004)."The angular sizes of dwarf stars and subgiants: Surface brightness relations calibrated by interferometry" .Astronomy & Astrophysics .426 (1):297– 307.arXiv :astro-ph/0404180 Bibcode :2004A&A...426..297K .doi :10.1051/0004-6361:20035930 eISSN 1432-0746 .ISSN 0004-6361 . ^a b Stassun, Keivan G.; et al. (9 September 2019)."The RevisedTESS Input Catalog and Candidate Target List" .The Astronomical Journal .158 (4): 138.arXiv :1905.10694 Bibcode :2019AJ....158..138S .doi :10.3847/1538-3881/ab3467 eISSN 1538-3881 .hdl :1721.1/124721 S2CID 166227927 . ^a b Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas (December 15, 2014)."Precise Radial Velocities of Giant Stars VII. Occurrence Rate of Giant Extrasolar Planets as a Function of Mass and Metallicity" .Astronomy & Astrophysics .574 . EDP Sciences: A116.arXiv :1412.4634 Bibcode :2015A&A...574A.116R .doi :10.1051/0004-6361/201322360 ISSN 0004-6361 .S2CID 59334290 . ^a b Hekker, S.; Meléndez, J. (December 2007)."Precise radial velocities of giant stars: III. Spectroscopic stellar parameters" .Astronomy & Astrophysics .475 (3):1003– 1009.arXiv :0709.1145 Bibcode :2007A&A...475.1003H .doi :10.1051/0004-6361:20078233 ISSN 0004-6361 .S2CID 10436552 . ^ "* 7 LMi" .SIMBAD Centre de données astronomiques de Strasbourg . RetrievedAugust 8, 2023 .^ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017)."Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars" .Monthly Notices of the Royal Astronomical Society .472 (4):3805– 3820.arXiv :1709.01160 Bibcode :2017MNRAS.472.3805G .doi :10.1093/mnras/stx2219 eISSN 1365-2966 .ISSN 0035-8711 .S2CID 118879856 . ^ Pertersson, J. H. (1927). "Distribution of stars in Carrington zone".Meddelanden Fran Astronomiska Observatorium Uppsala .29 : 1.Bibcode :1927MeUpp..29....1P . ^ Vallenari, A.; et al. (Gaia collaboration) (2023)."Gaia Data Release 3. Summary of the content and survey properties" .Astronomy and Astrophysics .674 : A1.arXiv :2208.00211 Bibcode :2023A&A...674A...1G .doi :10.1051/0004-6361/202243940 S2CID 244398875 . Gaia DR3 record for this source atVizieR .^ Gaia Collaboration (2022). "VizieR Online Data Catalog: Gaia DR3 Part 3. Non-single stars (Gaia Collaboration, 2022)".Vizier Online Data Catalog .Bibcode :2022yCat.1357....0G . ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001)."The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog" .The Astronomical Journal .122 (6):3466– 3471.Bibcode :2001AJ....122.3466M .doi :10.1086/323920 ISSN 0004-6256 .S2CID 119533755 .
