Magnetic Field Extreme Activity
Why is this a Gas Giant? Your planet has 5.7% hydrogen and helium, combined with a mass of 8.2x Earth, which exceeds the gas giant threshold. Gas giants form when massive cores capture enormous atmospheres of light gases. They typically form beyond the 'frost line' where volatiles can condense.
✓ Hydrogen + Helium: 5.7% (>60% required) ✓ Mass: 8.2x Earth (>10x required)
Habitability Score Uninhabitable
Contributing Factors water 5
No solid surface — any water is locked in a supercritical mantle and hot ice, not oceans (water stripped by extreme rotation) geology 40
Extreme volcanic activity may be hazardous rotation 5
Extreme rotation (< 4 hrs) - winds exceeding 1000 mph, constant category 5 hurricanes, uninhabitable surface Organic Chemistry 25
Carbon and hydrogen present - organic chemistry possible - chlorine-laced environment attacks organic molecules atmosphere 9
Hydrogen-rich atmosphere typical of gas giants (severely compromised by extreme rotation) temperature 20
Very cold - water frozen, challenging for life magnetic Field 100
Magnetic field provides radiation protection Physical Properties Mass
8.20x Earth (4.90e+25 kg) Radius
2.02x Earth (12,847 km) This planet: 2.02× Earth radius Earth: 1× (baseline)
Surface Gravity
2.02x Earth (19.8 m/s²) Surface Temperature
121 K (-152 °C / -242 °F) Rotation Period
3.0 hours/day (faster than Earth) This planet: 3 h/day Earth: 24 h/day Orbital Environment Star Type
NS-type (Neutron Star) Distance from Star
0.73 AU (109 million km) Atmosphere Hydrogen and helium dominated with trace methane and ammonia
Surface Characteristics No solid surface - thick gaseous envelope with possible rocky core deep within Closest Real Exoplanet Orbiting GJ 229 Yours GJ 229 b Mass 8.20 × Earth 14.9 × Earth Radius 3.26 × Earth 3.97 × Earth Density (composition) 1.30 g/cm³ 1.31 g/cm³ Temperature 121.1 K 112.0 K Starlight received 0.02 × Earth 0.02 × Earth Star temperature — 3,564 K
Matched on physical properties only — but pulsar planets are real: the first exoplanets ever confirmed (PSR B1257+12, 1992) orbit a neutron star. Discovered 2014 via radial velocity · 19 light-years away Source: NASA Exoplanet Archive Browse all 5,568 real exoplanets Learn more about exoplanets