Entering orbit…

Habitability

30/ 100

Extremely Harsh

MOON SWARM

Gas Giant

Magnetic FieldExtreme Activity

Why is this a Gas Giant?Your planet has 85.9% hydrogen and helium, combined with a mass of 400.0x 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.

Classification Criteria:

✓ Hydrogen + Helium: 85.9% (>60% required)✓ Mass: 400.0x Earth (>10x required)

Habitability ScoreExtremely Harsh

Contributing Factors

water15

No solid surface — any water is locked in a supercritical mantle and hot ice, not oceans

geology40

Extreme volcanic activity may be hazardous

rotation100

Optimal rotation period - balanced day/night cycle, moderate weather, and good heat distribution

Organic Chemistry84

Core organic elements (CHNO) present (tidal pools cycle wet and dry - a boost for prebiotic chemistry)

atmosphere30

Hydrogen-rich atmosphere typical of gas giants

temperature20

Very cold - water frozen, challenging for life

magnetic Field100

Magnetic field provides radiation protection

Physical Properties

Mass

400.00x Earth (2.39e+27 kg)

Radius

7.37x Earth (46,942 km)

Surface Gravity

7.37x Earth (72.3 m/s²)

Surface Temperature

122 K (-151 °C / -240 °F)

Rotation Period

10.0 hours/day (faster than Earth)

Orbital Environment

Star Type

G-type (Yellow (Sun-like))

Distance from Star

5.20 AU (778 million km)

Orbital Period

11.9 years

Atmosphere

Hydrogen and helium dominated with trace methane and ammonia

Elemental Composition

H - Hydrogen

55.6%

He - Helium

30.3%

C - Carbon

5.1%

Surface Characteristics

No solid surface - thick gaseous envelope with possible rocky core deep within

Closest Real Exoplanet

HIP 39330 b90% similar

Orbiting HIP 39330

	Yours	HIP 39330 b
Mass	400.0 × Earth	531.0 × Earth
Radius	11.9 × Earth	13.5 × Earth
Density (composition)	1.30 g/cm³	1.19 g/cm³
Temperature	122.0 K	125.0 K
Starlight received	0.04 × Earth	0.04 × Earth
Star temperature	5,600 K	5,748 K

Discovered 2026 via radial velocity · 119 light-years awaySource: NASA Exoplanet Archive

Moons

Moon 1stable0.00030% - 4.0 radii