GJ 436 b
Description: Gliese 436 b is a Neptune-sized exoplanet orbiting the red dwarf Gliese 436. It was the first hot Neptune discovered with certainty and was among the smallest-known transiting planets in mass and radius, until the much smaller Kepler exoplanet discoveries began circa 2010.
Physical Properties
Mass (Jupiter mass): 0.07 MJ
Radius (Jupiter radius): 0.372 RJ
Density: 1.8 g/cm³
Equilibrium Temperature: 686.0 K
Orbital Parameters
Orbital Period: 2.64388312 days
Semi-major Axis: 0.0291 AU
Eccentricity: 0.13827
Inclination: 86.44°
Host Star Properties
Host Star: GJ 436
Spectral Type: M2.5 V
Temperature: 3586.11 K
Stellar Mass: 0.47 M☉
Stellar Radius: 0.46 R☉
Discovery Information
Planet Letter: b
Object ID: 3.10974
Host ID: 2.56476
Discovery Date: 2004-12
Discovery Year: 2004
Discovery Method: Radial Velocity
Discovery Locale: Ground
Discovery Facility: W. M. Keck Observatory
Discovery Instrument: HIRES Spectrometer