Sarnus
0
Gas Giant
✦ KerbolMagnetic FieldExtreme Activity
Why is this a Gas Giant?Your planet has 81.7% hydrogen and helium, combined with a mass of 21.0x 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: 81.7% (>60% required)✓ Mass: 21.0x Earth (>10x required)
Habitability ScoreUninhabitable
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
rotation10
Near tidally locked - one hemisphere perpetually scorched, other frozen, narrow habitable twilight zone only
Organic Chemistry100
All CHNOPS elements present - building blocks of life (tidal pools cycle wet and dry - a boost for prebiotic chemistry)
atmosphere12
Hydrogen-rich atmosphere typical of gas giants (partially stripped by slow rotation)
temperature10
Frozen world - minimal potential for complex life
magnetic Field100
Magnetic field provides radiation protection
Physical Properties
Mass
21.00x Earth (1.25e+26 kg)Radius
2.76x Earth (17,577 km)Surface Gravity
2.76x Earth (27.1 m/s²)Surface Temperature
91 K (-182 °C / -296 °F)Rotation Period
9.0 hours/day (faster than Earth)Orbital Environment
Star Type
G-type (Yellow (Sun-like))Distance from Star
9.50 AU (1.42 billion km)Orbital Period
29.3 yearsAtmosphere
Hydrogen and helium dominated with trace methane and ammonia
Elemental Composition
H - Hydrogen
52.9%
He - Helium
28.8%
C - Carbon
5.8%
Surface Characteristics
No solid surface - thick gaseous envelope with possible rocky core deep withinClosest Real Exoplanet
GJ 687 c85% similar
Orbiting GJ 687| Yours | GJ 687 c | |
|---|---|---|
| Mass | 21.0 × Earth | 16.0 × Earth |
| Radius | 4.46 × Earth | 4.14 × Earth |
| Density (composition) | 1.30 g/cm³ | 1.24 g/cm³ |
| Temperature | 90.8 K | 99.0 K |
| Starlight received | 0.01 × Earth | 0.02 × Earth |
| Star temperature | 5,600 K | 3,413 K |
Moons
Moon 1rings0.095% - 2.2 radii
Inside the synchronous orbit: it spiraled inward and was torn apart at the Roche limit (Phobos's fate).
Moon 2stableOcean world0.010% - 7.9 radii
Small and distant: a quiet, stable companion.
A thin tidal-warmed subsurface ocean may exist, but conditions are marginal (2/100).
Moon 3stableOcean world0.045% - 11.7 radii
Small and distant: a quiet, stable companion.
A thin tidal-warmed subsurface ocean may exist, but conditions are marginal (3/100).
Moon 4stable0.040% - 27.2 radii
Small and distant: a quiet, stable companion.
Moon 5receding0.056% - 63.0 radii
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).