88 Leonis information

88 Leonis
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Leo
Right ascension	11h 31m 44.94461s
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
Distance	77.2 ± 0.1 ly ; (23.66 ± 0.05 pc)
Absolute magnitude (MV)	4.46
Details
88 Leo A
Mass	1.06 M☉
Radius	1.10+0.03; −0.05 R☉
Luminosity	1.470±0.004 L☉
Surface gravity (log g)	4.25 cgs
Temperature	6,060+140; −76 K
Metallicity [Fe/H]	−0.06±0.02 dex
Rotation	14.32 days
Age	5.7+1.6; −3.1 Gyr
88 Leo B
Mass	0.74 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
SIMBAD	data

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]

^ ^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).
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference Halbwacks2017 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference Halbwachs2018 was invoked but never defined (see the help page).
^ Cite error: The named reference Hinkel2017 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference Oláh2009 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference Tokovinin2016 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference SIMBADA was invoked but never defined (see the help page).
^ Cite error: The named reference SIMBADB was invoked but never defined (see the help page).
^ Cite error: The named reference Lepine2005 was invoked but never defined (see the help page).

[GaiaDR2-1] ^ ^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).

[Anderson2012-2] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).

[Halbwacks2017-3] Cite error: The named reference Halbwacks2017 was invoked but never defined (see the help page).

[Gray2006-4] Cite error: The named reference Gray2006 was invoked but never defined (see the help page).

[Halbwachs2018-5] Cite error: The named reference Halbwachs2018 was invoked but never defined (see the help page).

[Hinkel2017-6] Cite error: The named reference Hinkel2017 was invoked but never defined (see the help page).

[Oláh2009-7] Cite error: The named reference Oláh2009 was invoked but never defined (see the help page).

[Tokovinin2016-8] Cite error: The named reference Tokovinin2016 was invoked but never defined (see the help page).

[SIMBADA-9] Cite error: The named reference SIMBADA was invoked but never defined (see the help page).

[SIMBADB-10] Cite error: The named reference SIMBADB was invoked but never defined (see the help page).

[Lepine2005-11] Cite error: The named reference Lepine2005 was invoked but never defined (see the help page).

Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Leo
Right ascension	11^h 31^m 44.94461^s^[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 (R_v)	−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]
Distance	77.2 ± 0.1 ly (23.66 ± 0.05 pc)
Absolute magnitude (M_V)	4.46^[2]

Details
88 Leo A
Mass	1.06^[5] `M`_☉
Radius	1.10+0.03 −0.05^[1] `R`_☉
Luminosity	1.470±0.004^[1] `L`_☉
Surface gravity (log g)	4.25^[6] cgs
Temperature	6,060+140 −76^[1] K
Metallicity [Fe/H]	−0.06±0.02^[2] dex
Rotation	14.32 days^[7]
Age	5.7+1.6 −3.1^[2] Gyr
88 Leo B
Mass	0.74^[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
SIMBAD	data

88 Leonis information

and 23 Related for: 88 Leonis information

88 Leonis

List of stars in Leo

List of stars in Leo Minor

Mu Leonis

Denebola

Leone Leoni

Delta Leonis

83 Leonis

Leo Minor

Upsilon Leonis

Giacomo Leoni

IAU designated constellations

Omega Leonis

DP Leonis

58 Leonis

Xi Leonis

89 Leonis

Kappa Leonis

56 Leonis

Tau Leonis

List of municipalities in Michigan

Chi Leonis

Tristan