Star in the constellation Leo
88 Leonis Observation dataEpoch J2000.0 Equinox J2000.0 (ICRS ) Constellation Leo [ 1] A Right ascension 11h 31m 44.94416s [ 2] Declination +14° 21′ 52.2107″[ 2] Apparent magnitude (V)6.27[ 3] B Right ascension 11h 31m 44.41783s [ 4] Declination +14° 22′ 05.6745″[ 4] Apparent magnitude (V)9.22[ 5] Characteristics A Evolutionary stage main sequence [ 2] Spectral type F9.5V[ 6] U−Bcolor index +0.07[ 3] B−Vcolor index +0.57[ 3] B Evolutionary stage main sequence [ 7] Spectral type G5[ 5] U−Bcolor index +1.03[ 8] B−Vcolor index +1.14[ 8] Astrometry A Radial velocity (Rv )± 0.13[ 2] km/s Proper motion (μ)RA: −3329.873[ 2] mas /yr Dec.: −189.925[ 2] mas /yr Parallax (π)42.6536± 0.0726 mas [ 4] Distance 76.5 ± 0.1 ly pc ) Absolute magnitude (MV )+4.30[ 9] B Radial velocity (Rv )± 0.17[ 4] km/s Proper motion (μ)RA: −315.623[ 4] mas /yr Dec.: −181.122[ 4] mas /yr Parallax (π)42.3382± 0.0223 mas [ 4] Distance 77.04 ± 0.04 ly pc ) Absolute magnitude (MV )+7.31[ 9] Details 88 Leo A Mass 1.06[ 10] M ☉ Radius 1.12[ 10] R ☉ Luminosity 1.40[ 7] L ☉ Surface gravity (log g )4.25[ 11] cgs Temperature 5,990[ 10] K Metallicity [Fe/H] +0.03[ 10] dex Rotation 14.32 days[ 12] Rotational velocity (v sin i )1.7[ 13] Age 4.12[ 14] Gyr 88 Leo B Mass 0.69[ 15] M ☉ Radius 0.72[ 15] R ☉ Luminosity 0.18[ 15] L ☉ Surface gravity (log g )4.57[ 15] cgs Temperature 4,423[ 15] K Other designations STF 1547 AB,88 Leonis ,BD +15°2345HD 100180HIP 56242HR 4437WDS J11317+1422Wolf 401[ 16] 88 Leo A :AG +14°1209GJ 3669SAO 99648LTT 13145[ 16] 88 Leo B :AG +14°1208GJ 3670SAO 99647LTT 13146[ 17] Database references SIMBAD data B
88 Leonis is a wide binary[ 18] star system in theequatorial constellation ofLeo , the lion. The system is near the lower limit of visibility to the naked eye with a combinedapparent visual magnitude of 6.2.[ 19] light years from theSun based onparallax , but is drifting closer with aradial velocity of about −4.6 km/s. It has a relatively highproper motion , traversing thecelestial sphere at the rate of 0.379 arc seconds per annum.[ 20]
The primary member of the system, component A, is a yellow-white huedF-type main-sequence star with astellar classification of F9.5V.[ 6] [ 14] rotation period of 14.3 days.[ 12] magnetic activity cycle that averages around 3.5 years. A second cycle appears to vary over time, lasting 13.7 years at the start of observations then decreasing to 8.6 years over a span of 34 years of measurement.[ 12] mass of the Sun and 1.1 times theSun's radius .[ 10] luminosity of the Sun from itsphotosphere [ 7] effective temperature ofK [ 10]
The secondary, component B, is a magnitude 9.22[ 5] angular separation of″ position angle of 326°.[ 21] [ 5] [ 15] common proper motion through space with aprojected separation ofAU [ 21]
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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 c d Halbwachs, J. -L.; et al. (2017), "Double stars with wide separations in the AGK3 - II. The wide binaries and the multiple systems",Monthly Notices of the Royal Astronomical Society ,464 (4): 4966,arXiv :1610.04423 Bibcode :2017MNRAS.464.4966H ,doi :10.1093/mnras/stw2683 ^a b Gray, R. O.; et al. 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"The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics".Astronomy and Astrophysics .501 (3): 941.arXiv :0811.3982 Bibcode :2009A&A...501..941H .doi :10.1051/0004-6361/200811191 . ^a b c d e f Hirsch, Lea A.; Rosenthal, Lee; Fulton, Benjamin J.; Howard, Andrew W.; Ciardi, David R.; Marcy, Geoffrey W.; Nielsen, Eric; Petigura, Erik A.; De Rosa, Robert J.; Isaacson, Howard; Weiss, Lauren M.; Sinukoff, Evan; MacIntosh, Bruce (2021)."Understanding the Impacts of Stellar Companions on Planet Formation and Evolution: A Survey of Stellar and Planetary Companions within 25 pc" .The Astronomical Journal .161 (3): 134.arXiv :2012.09190 Bibcode :2021AJ....161..134H .doi :10.3847/1538-3881/abd639 ^ Hinkel, Natalie R.; et al. (October 2017), "A Catalog of Stellar Unified Properties (CATSUP) for 951 FGK-Stars within 30 pc",The Astrophysical Journal ,848 (1): 19,arXiv :1709.04465 Bibcode :2017ApJ...848...34H ,doi :10.3847/1538-4357/aa8b0f S2CID 118941011 , 34. ^a b c Oláh, K.; et al. (July 2009), "Multiple and changing cycles of active stars. II. Results",Astronomy and Astrophysics ,501 (2):703– 713,arXiv :0904.1747 Bibcode :2009A&A...501..703O ,doi :10.1051/0004-6361/200811304 ,S2CID 15498919 . ^ Baum, Anna C.; Wright, Jason T.; Luhn, Jacob K.; Isaacson, Howard (2022)."Five Decades of Chromospheric Activity in 59 Sun-like Stars and New Maunder Minimum Candidate HD 166620" .The Astronomical Journal .163 (4): 183.arXiv :2203.13376 Bibcode :2022AJ....163..183B .doi :10.3847/1538-3881/ac5683 ^a b Isaacson, Howard; et al. (2024)."The California Legacy Survey. V. 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