Why is this a Carbon World?Your planet's carbon (24.7%) outweighs its oxygen (3.4%), so the mineralogy flips from silicate rock to carbide - a graphite crust over a diamond mantle.
Carbon worlds form in carbon-rich disks where there isn't enough oxygen to bind it all into silicates. Instead carbon condenses directly into graphite, carbides, and - under pressure at depth - diamond. They form water-poor, so no life takes hold.
Very dry - minimal water - boiling away, little would be retained
geology90
Active geology recycles nutrients and drives carbon cycle
rotation10
Near tidally locked - one hemisphere perpetually scorched, other frozen, narrow habitable twilight zone only
Organic Chemistry75
All CHNOPS elements present - building blocks of life - chlorine-laced environment attacks organic molecules
atmosphere16
Atmosphere present but composition not ideal for life (partially stripped by slow rotation)
temperature20
Extremely hot - hostile to known life forms (large moon stabilizes the axial tilt - steady seasons)
magnetic Field100
Magnetic field provides radiation protection (a large close moon may help stir the core dynamo (speculative)) — but the remnant's shock fronts flood this orbit with cosmic rays
Physical Properties
Mass
4.00x Earth (2.39e+25 kg)
Radius
1.59x Earth (10,113 km)
Surface Gravity
1.59x Earth (15.6 m/s²)
Surface Temperature
585 K (312 °C / 594 °F)
Rotation Period
76.0 hours/day (slower than Earth)
Orbital Environment
Star Type
SNR-type (Supernova Remnant)
Distance from Star
0.16 AU (23.9 million km)
Orbital Period
20 days
Atmosphere
Carbon monoxide and methane haze over a graphite surface
Elemental Composition
C - Carbon
24.7%
Cl - Chlorine
9.2%
Ti - Titanium
7.5%
Surface Characteristics
Graphite plains and carbide ridges over a diamond mantle - a glittering coal-black world