Magnetic Field Moderate Activity
Why is this a Ice Giant? Your planet has moderate mass (16.0x Earth) with significant water, carbon, and nitrogen content, characteristic of ice giants. Ice giants like Uranus and Neptune have icy interiors with thick atmospheres of hydrogen and helium, but not enough to be classified as gas giants.
✓ Mass: 16.0x Earth (5-20x range) ✓ Water/Carbon/Nitrogen rich composition
Habitability Score Extremely Harsh
Contributing Factors water 15
No solid surface — any water is locked in a supercritical mantle and hot ice, not oceans geology 90
Active geology recycles nutrients and drives carbon cycle rotation 65
Slow rotation - significant day/night temperature variations, but life can adapt Organic Chemistry 50
Carbon and hydrogen present - organic chemistry possible atmosphere 30
Hydrogen-rich atmosphere typical of gas giants temperature 20
Very cold - water frozen, challenging for life magnetic Field 100
Magnetic field provides radiation protection Physical Properties Mass
16.00x Earth (9.56e+25 kg) Radius
2.52x Earth (16,054 km) This planet: 2.52× Earth radius Earth: 1× (baseline)
Surface Gravity
2.52x Earth (24.7 m/s²) Surface Temperature
136 K (-137 °C / -214 °F) Rotation Period
74.0 hours/day (slower than Earth) This planet: 74 h/day Earth: 24 h/day Orbital Environment Star Type
G-type (Yellow (Sun-like)) Distance from Star
7.53 AU (1.13 billion km) Atmosphere Hydrogen and helium with water, methane, and ammonia ices
Surface Characteristics Icy mantle surrounding rocky core, with hydrogen-helium atmosphere Closest Real Exoplanet GJ 229 b 87% similar
Orbiting GJ 229 Yours GJ 229 b Mass 16.0 × Earth 14.9 × Earth Radius 3.81 × Earth 3.97 × Earth Density (composition) 1.60 g/cm³ 1.31 g/cm³ Temperature 136.2 K 112.0 K Starlight received 0.02 × Earth 0.02 × Earth Star temperature 5,600 K 3,564 K
Discovered 2014 via radial velocity · 19 light-years away Source: NASA Exoplanet Archive Moons
Moon 1 stable 0.0018% - 20.3 radii
Small and distant: a quiet, stable companion.
Moon 2 merged 0.00063% - 18.6 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
Moon 3 stable 0.010% - 17.5 radii
Small and distant: a quiet, stable companion.
Moon 4 rings 0.00013% - 1.8 radii
Inside the synchronous orbit: it spiraled inward and was torn apart at the Roche limit (Phobos's fate).
