Planet gamma1 Leo b

Detailed information about planet gamma1 Leo b and its parameters.

Planet parameters Publications Observability Predictor

Planet

Name

gamma1 Leo b

Planet Status

Confirmed

Discovered in

2009

Update

2024-07-31

Mass

63.88 (\begin{matrix} + 72.91 \\ - 56.1 \end{matrix})

M_J

Mass*sin(i)

8.78 (\begin{matrix} + 1.0 \\ - 1.0 \end{matrix})

M_J 1 publication

Detection of a planetary companion around the giant star γ¹ Leonis

Semi-Major Axis

1.19 (\pm 0.02)

AU 1 publication

Detection of a planetary companion around the giant star γ¹ Leonis

Orbital Period

428.5 (\pm 1.25)

day 1 publication

Detection of a planetary companion around the giant star γ¹ Leonis

Eccentricity

0.144 (\pm 0.046)

1 publication

Detection of a planetary companion around the giant star γ¹ Leonis

ω

206.7 (\pm 9.2)

deg 1 publication

Detection of a planetary companion around the giant star γ¹ Leonis

T_peri

2451236.0 (\pm 13.5)

JD 1 publication

Detection of a planetary companion around the giant star γ¹ Leonis

Radius

—

Inclination

172.1 (\begin{matrix} + 3.8 \\ - 98.6 \end{matrix})

deg 1 publication

Mass constraints on substellar companions candidates from the re-reduced Hipparcos intermediate astrometric data: Nine confirmed planets and two confirmed brown dwarfs

Detection Method

Radial Velocity

Mass Meas. Method

—

Radius Meas. Method

—

Primary transit

—

Secondary transit

—

λ

—

Impact Parameter b

—

Time V_r=0

—

Velocity Semiamplitude K

—

Calculated temperature

—

Measured temperature

—

Hottest point longitude

—

Geometric albedo

—

Surface gravity log(g/g_H)

—

Alternate Names

Algieba b, gam1 Leo b

Data Source	Type	Result Value	Result Figure	Notes	Reference

Molecule	Data Source	Type	Result Value	Result Figure	Notes	Reference

11 Jan 2011: Reffert et al. 2011 give a mass range derived from astrometry 9.2-130.9 M_Jup at the 3σ level. 28 Jul. 2024: See also Planets in Binaries webpage.

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Star

Name

gamma1 Leo

Distance

38.5 (\pm 1.0)

Spectral type

K0III

Apparent magnitude V

2.01

Mass

1.23 (\pm 0.21)

M_Sun 1 publication

Detection of a planetary companion around the giant star γ¹ Leonis

Age

—

Effective temperature

4330.0 (\pm 15.0)

K 1 publication

Detection of a planetary companion around the giant star γ¹ Leonis

Radius

31.88 (\pm 1.61)

R_Sun 1 publication

Detection of a planetary companion around the giant star γ¹ Leonis

Metallicity [Fe/H]

-0.51 (\pm 0.05)

1 publication

Detection of a planetary companion around the giant star γ¹ Leonis

Detected Disc

—

Magnetic Field

—

RA₂₀₀₀

10:19:58.0

Dec₂₀₀₀

+19:50:29.0

Alternate Names

Algieba, gam1 Leo, HD 89484

Algieba has a nearly equal companion star (gam^{2 Leo) 182 AUs away. Formerly listed as "gam Leo C", AD Leonis is only a visual companion, not gravitationally bound to the system.}

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