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88 Leonis

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Star in the constellation Leo
88 Leonis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Leo
Right ascension 11 31 44.94461
Declination +14° 21′ 52.2131″
Apparent magnitude (V) 6.27 + 9.22
Characteristics
Spectral type F9.5V + G5
B−V color index 0.570
Astrometry
Radial velocity (Rv)−4.81±0.09 km/s
Proper motion (μ) RA: −330.279 mas/yr
Dec.: −190.081 mas/yr
Parallax (π)42.2619 ± 0.0812 mas
Distance77.2 ± 0.1 ly
(23.66 ± 0.05 pc)
Absolute magnitude (MV)4.46
Details
88 Leo A
Mass1.06 M
Radius1.10+0.03
−0.05 R
Luminosity1.470±0.004 L
Surface gravity (log g)4.25 cgs
Temperature6,060+140
−76 K
Metallicity −0.06±0.02 dex
Rotation14.32 days
Age5.7+1.6
−3.1 Gyr
88 Leo B
Mass0.74 M
Other designations
STF 1547 AB, 88 Leonis, BD+15°2345, HD 100180, HIP 56242, HR 4437, WDS J11317+1422, Wolf 401
88 Leo A: AG+14°1209, GJ 3669, SAO 99648, LTT 13145
88 Leo B: AG+14°1208, GJ 3670, SAO 99647, LTT 13146
Database references
SIMBADdata

88 Leonis is a wide binary star system in the equatorial constellation of Leo, the lion. The system is near the lower limit of visibility to the naked eye with an apparent visual magnitude of 6.27. It is located at a distance of 77 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −4.8 km/s. It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.379 arc seconds per annum.

The primary member of the system, component A, is a yellow-white hued F-type main-sequence star with a stellar classification of F9.5V. It is an estimated 5.7 billion years old and is spinning with a rotation period of 14.3 days. The star has a short 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. The star has 1.06 times the mass of the Sun and 1.10 times the Sun's radius. It is radiating 1.47 times the luminosity of the Sun from its photosphere at an effective temperature of 6,060 K.

The secondary, component B, is a magnitude 9.22 star at an angular separation of 15.46 from the primary along a position angle of 326°. It has a class of G5 and 74% of the Sun's mass. The pair share a common proper motion through space with a projected separation of 360.6 AU.

References

  1. ^ 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.
  2. ^ 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.
  3. ^ 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.
  4. ^ Gray, R. O.; et al. (2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992.
  5. ^ Halbwachs, J. -L; et al. (2018), "Multiplicity among solar-type stars. IV. The CORAVEL radial velocities and the spectroscopic orbits of nearby K dwarfs", Astronomy and Astrophysics, 619: A81, arXiv:1808.04605, Bibcode:2018A&A...619A..81H, doi:10.1051/0004-6361/201833377, S2CID 119437322
  6. 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.
  7. ^ 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.
  8. ^ Tokovinin, A.; Kiyaeva, O. (February 2016), "Eccentricity distribution of wide binaries", Monthly Notices of the Royal Astronomical Society, 456 (2): 2070–2079, arXiv:1512.00278, Bibcode:2016MNRAS.456.2070T, doi:10.1093/mnras/stv2825.
  9. ^ "88 Leo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-10-05.
  10. "88 Leo B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-10-05.
  11. Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854, S2CID 2603568.
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