A gas dwarf with a thin ring system and two ocean moons. It has pink and dark blue auroras at the poles due to a strong magnetic field.
Gas Dwarf
Magnetic FieldLow Activity
Why is this a Gas Dwarf?Your planet has an unusual composition that doesn't fit standard classifications, or lacks the elements needed for complex geological processes.
Barren worlds can form from uncommon element combinations or may be remnants of larger bodies that lost their atmospheres and volatile materials.
Classification Criteria:
Composition doesn't match standard planet typesMass: 6.7x EarthTemperature: 280K
Habitability ScoreUninhabitable
17
Contributing Factors
water15
No solid surface — any water is locked in a supercritical mantle and hot ice, not oceans
geology60
Some geological activity provides slow nutrient cycling
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)
temperature100
Optimal temperature range for liquid water and life
magnetic Field100
Magnetic field provides radiation protection — but the black hole's accretion disk bathes this orbit in hard X-ray radiation
Physical Properties
Mass
6.70x Earth (4.00e+25 kg)
Radius
1.89x Earth (12,011 km)
Surface Gravity
1.89x Earth (18.5 m/s²)
Surface Temperature
280 K (7 °C / 45 °F)
Rotation Period
7.0 hours/day (faster than Earth)
Orbital Environment
Star Type
BH-type (Black Hole)
Distance from Star
19.70 AU (2.95 billion km)
Orbital Period
27.7 years
Atmosphere
Deep hydrogen-helium envelope with photochemical haze
Elemental Composition
H - Hydrogen
26.3%
He - Helium
21.1%
N - Nitrogen
18.4%
Surface Characteristics
No solid surface - a thick gas envelope wrapped around a small deep core (a mini-Neptune)
Matched on physical properties only — no confirmed exoplanet orbits a black hole.Discovered 2016 via transit · 3,089 light-years awaySource: NASA Exoplanet Archive