Gamma Leonis information

γ Leonis
	Location of γ Leonis (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Leo
Right ascension	10h 19m 58.35056s
Declination	+19° 50′ 29.3468″
Apparent magnitude (V)	2.08 (2.37/3.64)
Characteristics
Evolutionary stage	Red clump (both stars)
Spectral type	K0III + G7III
U−B color index	1.00
B−V color index	1.14
Variable type	RS CVn
Astrometry
Radial velocity (Rv)	−36.24±0.18 km/s
Proper motion (μ)	RA: +304.30 mas/yr ; Dec.: −154.28 mas/yr
Parallax (π)	25.07 ± 0.52 mas
Distance	130 ± 3 ly ; (39.9 ± 0.8 pc)
Absolute magnitude (MV)	−0.27/+0.98
Orbit
Period (P)	554±27 yr
Semi-major axis (a)	3.1±0.1″
Eccentricity (e)	0.93±0.02
Inclination (i)	41±5°
Longitude of the node (Ω)	143.4°
Periastron epoch (T)	1671.3
Details
γ Leo A
Mass	1.66±0.14 M☉
Radius	26.08±0.79 R☉
Luminosity	250 L☉
Surface gravity (log g)	1.8±0.04 cgs
Temperature	4457±63 K
Metallicity [Fe/H]	−0.41±0.03 dex
Rotational velocity (v sin i)	1.41 km/s
Age	1.75±0.43 Gyr
γ Leo B
Mass	1.55±0.08 M☉
Radius	10.55±0.29 R☉
Luminosity	63.1 L☉
Surface gravity (log g)	2.56±0.04 cgs
Temperature	4969±15 K
Metallicity [Fe/H]	–0.38 ± 0.02 dex
Rotational velocity (v sin i)	1.62 km/s
Age	2.12±0.33 Gyr
Other designations
	Algieba, γ Leonis, 41 Leo, NSV 4823, BD+20°2467, HIP 50583, WDS 10200+1950, LTT 12764/12765
	γ Leo A: γ1 Leonis, HD 89484, HR 4057, SAO 81298
	γ Leo B: γ2 Leonis, HD 89485, HR 4058, SAO 81299
Position (relative to A)
Component	B
Epoch of observation	1820 – 2022
Angular distance	3.7" (1820), 4.7" (2022)″
Database references
SIMBAD	data
Exoplanet Archive	data

Gamma Leonis (γ Leonis, abbreviated Gamma Leo, γ Leo), also named Algieba /ælˈdʒiːbə/,^[8]^[9] is a binary star system in the constellation of Leo, made up of two red giants. In 2009, a planetary companion around the primary was announced.

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Observation data Epoch J2000 Equinox J2000
Location of γ Leonis (circled)
Constellation	Leo
Right ascension	10^h 19^m 58.35056^s^[1]
Declination	+19° 50′ 29.3468″^[1]
Apparent magnitude (V)	2.08 (2.37/3.64)^[2]
Characteristics
Evolutionary stage	Red clump (both stars)^[3]
Spectral type	K0III + G7III^[3]
U−B color index	1.00
B−V color index	1.14
Variable type	RS CVn^[4]
Astrometry

Radial velocity (R_v)	−36.24±0.18^[5] km/s
Proper motion (μ)	RA: +304.30^[1] mas/yr Dec.: −154.28^[1] mas/yr
Parallax (π)	25.07 ± 0.52 mas^[1]
Distance	130 ± 3 ly (39.9 ± 0.8 pc)^[1]
Absolute magnitude (M_V)	−0.27/+0.98^[6]

Orbit^[3]^{[note 1]}
Period (P)	554±27 yr
Semi-major axis (a)	3.1±0.1″
Eccentricity (e)	0.93±0.02
Inclination (i)	41±5°
Longitude of the node (Ω)	143.4^[7]°
Periastron epoch (T)	1671.3^[7]
Details^[3]
γ Leo A
Mass	1.66±0.14 `M`_☉
Radius	26.08±0.79 `R`_☉
Luminosity	250 `L`_☉
Surface gravity (log g)	1.8±0.04 cgs
Temperature	4457±63 K
Metallicity [Fe/H]	−0.41±0.03 dex
Rotational velocity (v sin i)	1.41 km/s
Age	1.75±0.43 Gyr
γ Leo B
Mass	1.55±0.08 `M`_☉
Radius	10.55±0.29 `R`_☉
Luminosity	63.1 `L`_☉
Surface gravity (log g)	2.56±0.04 cgs
Temperature	4969±15 K
Metallicity [Fe/H]	–0.38 ± 0.02 dex
Rotational velocity (v sin i)	1.62 km/s
Age	2.12±0.33 Gyr
Other designations
Algieba, γ Leonis, 41 Leo, NSV 4823, BD+20°2467, HIP 50583, WDS 10200+1950, LTT 12764/12765
γ Leo A: γ¹ Leonis, HD 89484, HR 4057, SAO 81298
γ Leo B: γ² Leonis, HD 89485, HR 4058, SAO 81299
Position (relative to A)^[2]

Component	B
Epoch of observation	1820 – 2022
Angular distance	3.7" (1820), 4.7" (2022)″
Database references
SIMBAD	data
Exoplanet Archive	data

Gamma Leonis information

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