Magnetic Field Low Activity
Why is this a Rocky Terrestrial? Your planet is dominated by silicate (23.3%) and iron (23.3%) content, forming a rocky terrestrial body. Rocky terrestrial planets are primarily composed of silicate rocks and metals. They're the most common type of small planet in the universe.
✓ Silicon: 23.3% + Iron: 23.3% + Magnesium: 0.0% ✓ Mass: 0.5x Earth (terrestrial range)
Habitability Score Uninhabitable
Contributing Factors water 0
No water - the recipe has no hydrogen and oxygen to form it geology 70
Some geological activity provides slow nutrient cycling (tidal flexing sustains geologic activity) rotation 10
Near tidally locked - one hemisphere perpetually scorched, other frozen, narrow habitable twilight zone only Organic Chemistry 54
Carbon and hydrogen present - organic chemistry possible (tidal pools cycle wet and dry - a boost for prebiotic chemistry) atmosphere 28
Nitrogen atmosphere provides protection but not breathable (partially stripped by slow rotation) temperature 10
Scorching - hot enough to melt lead, though rock stays solid; no chance for life (large moon stabilizes the axial tilt - steady seasons) magnetic Field 100
Magnetic field provides radiation protection — but the black hole's accretion disk bathes this orbit in hard X-ray radiation Physical Properties Mass
0.50x Earth (2.99e+24 kg) Radius
0.79x Earth (5,057 km) This planet: 0.79× Earth radius Earth: 1× (baseline)
Surface Gravity
0.79x Earth (7.8 m/s²) Surface Temperature
635 K (362 °C / 683 °F) Rotation Period
15.0 hours/day (faster than Earth) This planet: 15 h/day Earth: 24 h/day Orbital Environment Star Type
BH-type (Black Hole) Distance from Star
5.57 AU (833 million km) Atmosphere Thin nitrogen atmosphere
Surface Characteristics Rocky surface with impact craters, possible volcanic features Closest Real Exoplanet Orbiting Kepler-388 Yours Kepler-388 c Mass 0.50 × Earth 0.57 × Earth Radius 0.84 × Earth 0.86 × Earth Density (composition) 4.65 g/cm³ 4.90 g/cm³ Temperature 634.9 K 515.0 K Starlight received 12.9 × Earth 16.6 × Earth Star temperature — 4,498 K
Matched on physical properties only — no confirmed exoplanet orbits a black hole. Discovered 2014 via transit · 1,386 light-years away Source: NASA Exoplanet Archive Browse all 5,568 real exoplanets Learn more about exoplanets Moons
Moon 1 stable 0.00010% - 100.0 radii
Small and distant: a quiet, stable companion.
Tidal braking locked the planet to its moon: one face forever moonward.
Moon 2 merged 0.00010% - 100.0 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
Moon 3 receding 0.010% - 11.5 radii
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).
Moon 4 merged 0.25% - 12.8 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
Moon 5 receding 0.63% - 23.0 radii
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).
Moon 6 merged 0.00010% - 100.0 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
Moon 7 merged 0.00010% - 100.0 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
+5 temperature: large moon stabilizes the axial tilt - steady seasons +10 geology: tidal flexing sustains geologic activity +4 chemistry: tidal pools cycle wet and dry - a boost for prebiotic chemistry