GJ 436 b

System: GJ 436 system
Type: Hot gas giant

Also known as Gliese 436 b, this blue and cloudless planet is covered with hydrogen dioxide water. With an orbit that takes less than 3 standard days to complete, this world is toasty hot. But intense peressure and heat may force water into a crystalline structure like ice - only at extremely high temperatures.

Orbital parameters

Periastron Distance: 0.02 AU
Semi-major axis: 0.0278 AU
Apastron Distance: 0.03 AU
Orbital period: 2.6441 ± 0.0005 d.
Eccentricity: 0.12 ± 0.06
Omega (deg): 332 ± 11
Inclination: -
Gravitational Influence: 0.001 AU / 150000 km
Max Stable Prograde Moon Orbit: 0 AU / 50000 km

The world is in a close orbit around the primary, resulting in high temperatures. The fact that Gliese 436 b is an ice world means that it formed far from its Sun, and migrated to its present position.

Conditions

Atmosphere type: Hydrogen / helium
Estimated Periastron Temp: 681 K
Estimated Mean Temp: 639 K
Estimated Apastron Temp: 604 K
Max Angular Star Size: 13.032°
Mean Angular Star Size: 9.653°
Min Angular Star Size: 8.688°

Because of the intense pressures on the planet, the water "ice" is in an exotic chemical state, rock-hard and hot. The composition of the planet is about 50 percent rock and 50 percent water.