G-type giant in the constellation Leo Minor
7 Leonis Minoris
Location of 7 LMi on the map (circled)
Observation dataEpoch J2000.0 Equinox J2000.0 (ICRS )
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−V color index
+1.05[ 5]
Astrometry Radial velocity (Rv )1.7± 0.9[ 6] Proper motion (μ) RA: −23.939 mas /yr [ 1] Dec.: −48.160 mas /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 −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°953,
BD +34°1999,
FK5 2755,
GC 13112,
HD 82087,
HIP 46652,
HR 3764,
SAO 61529,
CCDM J09307+3339A,
WDS J09307+3339A,
TIC 8855140[ 12] Database references SIMBAD data
7 Leonis Minoris (7 LMi) is a star located in the northern constellation Leo Minor . It is also designated as HD 82087 and HR 3764 . 7 LMi is faintly visible to the naked eye as a yellow-hued point of light with an apparent magnitude of 5.86.[ 2] Gaia DR3 parallax measurements imply a distance of 462 light-years [ 1] radial velocity of km/s [ 6] magnitudes due to interstellar extinction [ 13] absolute magnitude of −0.03.[ 7]
There have been disagreements on the object's stellar classification . 7 LMi is either a G-type giant star with a class of either G8 or G9 III,[ 4] K-type giant with a class of K0 III. It is most likely on the horizontal branch (95% fit),[ 3] helium fusion at its core . It has 2.74 times the mass of the Sun but at the age of 575 million years ,[ 3] radius of the Sun .[ 8] luminosity of the Sun [ 1] photosphere at an effective temperature of K [ 9] metallicity at [Fe/H] = −0.03[ 10] projected rotational velocity of km/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]
7 Leonis Minoris' companions[ 17]
Companion
Stellar classification PA (deg)Separation (arcsec)
Apparent magnitude
AG +33°954 (B)
G8 IV-V[ 4]
125
61.3
9.7
C
G5 V[ 4]
217
95.9
11.6
References
^ 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 at VizieR .^ 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 Revised TESS 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 . Retrieved August 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 . ^ 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 at VizieR .^ 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 .
