Magnetic Field Moderate Activity
Why is this a Ice Giant? Your planet has moderate mass (17.0x 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: 17.0x Earth (5-20x range) ✓ Water/Carbon/Nitrogen rich composition
Habitability Score Uninhabitable
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 10
Near tidally locked - one hemisphere perpetually scorched, other frozen, narrow habitable twilight zone only Organic Chemistry 84
Core organic elements (CHNO) present (tidal pools cycle wet and dry - a boost for prebiotic chemistry) atmosphere 12
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
17.00x Earth (1.02e+26 kg) Radius
2.57x Earth (16,382 km) This planet: 2.57× Earth radius Earth: 1× (baseline)
Surface Gravity
2.57x Earth (25.2 m/s²) Surface Temperature
197 K (-76 °C / -104 °F) Rotation Period
16.0 hours/day (faster than Earth) This planet: 16 h/day Earth: 24 h/day Orbital Environment Star Type
BH-type (Black Hole) Distance from Star
90.00 AU (13.5 billion km) Orbital Period
270.0 years Atmosphere Hydrogen and helium with water, methane, and ammonia ices
Surface Characteristics Icy mantle surrounding rocky core, with hydrogen-helium atmosphere Closest Real Exoplanet Orbiting GJ 876 Yours GJ 876 e Mass 17.0 × Earth 14.6 × Earth Radius 3.88 × Earth 3.92 × Earth Density (composition) 1.60 g/cm³ 1.34 g/cm³ Temperature 197.4 K 150.0 K Starlight received 0.05 × Earth 0.11 × Earth Star temperature — 3,294 K
Matched on physical properties only — no confirmed exoplanet orbits a black hole. Discovered 2010 via radial velocity · 15 light-years away Source: NASA Exoplanet Archive Browse all 5,568 real exoplanets Learn more about exoplanets Moons
Moon 1 rings 0.010% - 1.8 radii
Inside the synchronous orbit: it spiraled inward and was torn apart at the Roche limit (Phobos's fate).
Moon 2 stable 0.010% - 12.0 radii
Small and distant: a quiet, stable companion.
Tidal braking locked the planet to its moon: one face forever moonward.
Moon 3 merged 0.010% - 13.0 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
Moon 4 receding Ocean world 0.25% - 17.1 radii
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).
A thin tidal-warmed subsurface ocean may exist, but conditions are marginal (19/100).
Moon 5 merged 0.010% - 23.0 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
+4 chemistry: tidal pools cycle wet and dry - a boost for prebiotic chemistry