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88 Leonis

88 Leonis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Leo
Right ascension 11h 31m 44.94461s[1]
Declination +14° 21′ 52.2131″[1]
Apparent magnitude (V) 6.27[2] + 9.22[3]
Characteristics
Spectral type F9.5V[4] + G5[3]
B−V color index 0.570[2]
Astrometry
Radial velocity (Rv)−4.81±0.09[2] km/s
Proper motion (μ) RA: −330.279[1] mas/yr
Dec.: −190.081[1] mas/yr
Parallax (π)42.2619 ± 0.0812 mas[1]
Distance77.2 ± 0.1 ly
(23.66 ± 0.05 pc)
Absolute magnitude (MV)4.46[2]
Details
88 Leo A
Mass1.06[5] M☉
Radius1.10+0.03
−0.05[1] R☉
Luminosity1.470±0.004[1] L☉
Surface gravity (log g)4.25[6] cgs
Temperature6,060+140
−76[1] K
Metallicity [Fe/H]−0.06±0.02[2] dex
Rotation14.32 days[7]
Age5.7+1.6
−3.1[2] Gyr
88 Leo B
Mass0.74[8] M☉
Other designations
STF 1547 AB, 88 Leonis, BD+15°2345, HD 100180, HIP 56242, HR 4437, WDS J11317+1422, Wolf 401[9]
88 Leo A: AG+14°1209, GJ 3669, SAO 99648, LTT 13145[9]
88 Leo B: AG+14°1208, GJ 3670, SAO 99647, LTT 13146[10]
Database references
SIMBADdata

88 Leonis is a wide binary[5] 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.[2] 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.[2] It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.379 arc seconds per annum.[11]

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.[4] It is an estimated 5.7[2] billion years old and is spinning with a rotation period of 14.3 days.[7] 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.[7] The star has 1.06[5] times the mass of the Sun and 1.10[1] times the Sun's radius. It is radiating 1.47[1] times the luminosity of the Sun from its photosphere at an effective temperature of 6,060 K.[1]

The secondary, component B, is a magnitude 9.22[3] star at an angular separation of 15.46″ from the primary along a position angle of 326°.[8] It has a class of G5[3] and 74% of the Sun's mass. The pair share a common proper motion through space with a projected separation of 360.6 AU.[8]

  1. ^ a b c d e f g h i j k Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Halbwacks2017 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Halbwachs2018 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Hinkel2017 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Oláh2009 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Tokovinin2016 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference SIMBADA was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBADB was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Lepine2005 was invoked but never defined (see the help page).
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