Gas Giant Magnetic Field Extreme Activity
Why is this a Gas Giant? Your planet has 86.0% hydrogen and helium, combined with a mass of 317.0x 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.
✓ Hydrogen + Helium: 86.0% (>60% required) ✓ Mass: 317.0x Earth (>10x required)
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 40
Extreme volcanic activity may be hazardous rotation 30
Very slow rotation - severe temperature swings between eternal day and night sides Organic Chemistry 84
Core organic elements (CHNO) present (tidal pools cycle wet and dry - a boost for prebiotic chemistry) atmosphere 18
Hydrogen-rich atmosphere typical of gas giants (partially stripped by slow rotation) temperature 20
Very cold - water frozen, challenging for life magnetic Field 100
Magnetic field provides radiation protection Physical Properties Mass
317.00x Earth (1.89e+27 kg) Radius
6.82x Earth (43,440 km) This planet: 6.82× Earth radius Earth: 1× (baseline)
Surface Gravity
6.82x Earth (66.9 m/s²) Surface Temperature
124 K (-149 °C / -236 °F) Rotation Period
9.0 hours/day (faster than Earth) This planet: 9 h/day Earth: 24 h/day Orbital Environment Star Type
G-type (Yellow (Sun-like)) Distance from Star
5.03 AU (752 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 HD 154345 b 86% similar
Orbiting HD 154345 Yours HD 154345 b Mass 317.0 × Earth 377.0 × Earth Radius 11.0 × Earth 13.7 × Earth Density (composition) 1.30 g/cm³ 0.81 g/cm³ Temperature 124.2 K 119.0 K Starlight received 0.04 × Earth 0.03 × Earth Star temperature 5,600 K 5,468 K
Discovered 2006 via radial velocity · 60 light-years away Source: NASA Exoplanet Archive Moons
Moon 1 stable 0.00010% - 15.1 radii
Small and distant: a quiet, stable companion.
Moon 2 stable 0.00010% - 9.3 radii
Small and distant: a quiet, stable companion.
Moon 3 stable 0.00010% - 12.8 radii
Small and distant: a quiet, stable companion.
Moon 4 stable Ocean world 0.0045% - 6.0 radii
Small and distant: a quiet, stable companion.
A thin tidal-warmed subsurface ocean may exist, but conditions are marginal (3/100).
+4 chemistry: tidal pools cycle wet and dry - a boost for prebiotic chemistry 