Registry · exoplanet

gam1 Leo b

Exoplanet

harvesting The full record is being pulled from the archives right now — measurement tables, the Gaia row, catalogue photometry. This page will fill itself in.

Right ascension: 10h 19m 58.37s
Declination: +19° 50′ 29.0″
Galactic l, b: 216.55, 54.65
Magnitude V: 1.995
Distance: 39.888 pc

Planet

NASA Exoplanet Archive, composite parameters

Host star	gam1 Leo · K1 IIIb Fe-0.5
Discovery	Radial Velocity, 2009 · Bohyunsan Optical Astronomical Observatory
Orbital period	428.5 d
Semi-major axis	1.19 au
Eccentricity	0.144
Radius	12.5 R⊕ · 1.12 R♃
Mass	2,790.4 M⊕ · 8.78 M♃
Density	7.85 g/cm³
Equilibrium temperature	1,080.7 K
System distance	39.888 pc

Recorded parameters

4 quantities with a single published value

Parameter	Value	Unit	Uncertainty	As published	Source	Reference
Mass	2,790.43	M_earth	± 317.8	Radial Velocity	NASA Exoplanet Archive	Han et al. 2010
Orbital period	428.5	d	± 1.25	Radial Velocity	NASA Exoplanet Archive	Han et al. 2010
Semi-major axis	1.19	au	± 0.02	Radial Velocity	NASA Exoplanet Archive	Han et al. 2010
Eccentricity	0.144		± 0.046	Radial Velocity	NASA Exoplanet Archive	Han et al. 2010

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
gam1 Leo	Star	0″	—
* gam01 Leo	HighPM*	0.4199″	2.23
* gam01 Leo b	Planet	0.4199″	—
* gam Leo	**	0.4411″	—
* gam02 Leo	HighPM*	4.207″	—
V* AD Leo	HighPM*	328.2″	9.52
BD+20 2464	Star	365.9″	10.48
LEDA 4233085	Galaxy	468.1″	—
LP 429-81	HighPM*	518.4″	—

Provenance

where this card came from

Archive	Read at (UTC)	Record
Seeded from the bulk archive load; no per-object fetch yet.

Machine-readable: /api/v1/object/gam1-leo-b · Registry entry updated 2026-08-14.