Xi Leonis information

ξ Leonis
	Location of ξ Leonis (circled)
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Leo
Right ascension	09h 31m 56.74097s
Declination	+11° 17′ 59.3585″
Apparent magnitude (V)	4.97
Characteristics
Evolutionary stage	red clump
Spectral type	K0 III
U−B color index	+0.88
B−V color index	+1.04
Variable type	suspected
Astrometry
Radial velocity (Rv)	34.85±0.26 km/s
Proper motion (μ)	RA: −101.446 mas/yr ; Dec.: −82.543 mas/yr
Parallax (π)	14.2602 ± 0.1106 mas
Distance	229 ± 2 ly ; (70.1 ± 0.5 pc)
Absolute magnitude (MV)	0.663
Details
Mass	2.8 M☉
Radius	12 R☉
Luminosity	60 L☉
Surface gravity (log g)	2.7 cgs
Temperature	4,688 K
Metallicity [Fe/H]	−0.17 dex
Rotational velocity (v sin i)	1.0 km/s
Age	3.89±2.03 Gyr
Other designations
	ξ Leo, 5 Leo, BD+11°2053, HD 82395, HIP 46771, HR 3782, SAO 98627
Database references
SIMBAD	data

Xi Leonis (ξ Leo, ξ Leonis) is a solitary star in the zodiac constellation of Leo. It has an apparent visual magnitude of 5.0 and is faintly visible to the naked eye. The distance to this star, as determined by parallax measurements, is roughly 229 light years.

This is an evolved, K-type giant star with a stellar classification of K0 III.^[4] At an age of around four billion years, it has expanded to 12 times the radius of the Sun and shines with 60 times the Sun's luminosity. The effective temperature of the star's outer atmosphere is 4,688.^[7] In the General Catalogue of Variable Stars, it is listed as a suspected variable star based on a 1929 paper.^[5]

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^ ^a ^b ^c Cite error: The named reference Paczynski1999 was invoked but never defined (see the help page).
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^ ^a ^b ^c ^d ^e ^f Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
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[Soubiran2008-3] Cite error: The named reference Soubiran2008 was invoked but never defined (see the help page).

[Eggen1962-4] Cite error: The named reference Eggen1962 was invoked but never defined (see the help page).

[cgcvs2007-5] Cite error: The named reference cgcvs2007 was invoked but never defined (see the help page).

[Famaey2005-6] Cite error: The named reference Famaey2005 was invoked but never defined (see the help page).

[Massarotti2008-7] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).

[Glebocki2005-8] Cite error: The named reference Glebocki2005 was invoked but never defined (see the help page).

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

Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Location of ξ Leonis (circled)
Constellation	Leo
Right ascension	09^h 31^m 56.74097^s^[1]
Declination	+11° 17′ 59.3585″^[1]
Apparent magnitude (V)	4.97^[2]
Characteristics
Evolutionary stage	red clump^[3]
Spectral type	K0 III^[4]
U−B color index	+0.88^[2]
B−V color index	+1.04^[2]
Variable type	suspected^[5]
Astrometry

Radial velocity (R_v)	34.85±0.26^[6] km/s
Proper motion (μ)	RA: −101.446^[1] mas/yr Dec.: −82.543^[1] mas/yr
Parallax (π)	14.2602 ± 0.1106 mas^[1]
Distance	229 ± 2 ly (70.1 ± 0.5 pc)
Absolute magnitude (M_V)	0.663^[3]

Details

Mass	2.8^[1] `M`_☉
Radius	12^[7] `R`_☉
Luminosity	60^[7] `L`_☉
Surface gravity (log g)	2.7^[7] cgs
Temperature	4,688^[7] K
Metallicity [Fe/H]	−0.17^[7] dex
Rotational velocity (v sin i)	1.0^[8] km/s
Age	3.89±2.03^[3] Gyr

Other designations
ξ Leo, 5 Leo, BD+11°2053, HD 82395, HIP 46771, HR 3782, SAO 98627^[9]
Database references
SIMBAD	data

Xi Leonis information

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