Magnetic Field Moderate Activity
Why is this a Carbon World? Your planet's carbon (35.3%) outweighs its oxygen (8.8%), 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.
✓ Carbon: 35.3% (>=20% required) ✓ Carbon exceeds Oxygen: 35.3% > 8.8% ✓ Mass: 1.8x Earth (<=8x hycean ceiling)
Habitability Score Habitable
Contributing Factors water 60
Water present but mostly frozen geology 90
Active geology recycles nutrients and drives carbon cycle rotation 100
Optimal rotation period - balanced day/night cycle, moderate weather, and good heat distribution Organic Chemistry 80
Core organic elements (CHNO) present atmosphere 40
Atmosphere present but composition not ideal for life temperature 40
Extreme temperature - very difficult for life magnetic Field 100
Magnetic field provides radiation protection Physical Properties Mass
1.80x Earth (1.07e+25 kg) Radius
1.22x Earth (7,750 km) This planet: 1.22× Earth radius Earth: 1× (baseline)
Surface Gravity
1.22x Earth (11.9 m/s²) Surface Temperature
216 K (-57 °C / -71 °F) Rotation Period
20.0 hours/day (faster than Earth) This planet: 20 h/day Earth: 24 h/day Orbital Environment Star Type
B-type (Blue Giant) Distance from Star
598.60 AU (89.5 billion km) Orbital Period
4,631 years Atmosphere Carbon monoxide and methane haze over a graphite surface
Surface Characteristics Graphite plains and carbide ridges over a diamond mantle - a glittering coal-black world Closest Real Exoplanet Orbiting Teegarden's Star Yours Teegarden's Star d Mass 1.80 × Earth 0.82 × Earth Radius 1.32 × Earth 0.95 × Earth Density (composition) 4.36 g/cm³ 5.20 g/cm³ Temperature 215.9 K 159.0 K Starlight received 0.03 × Earth 0.12 × Earth Star temperature 20,000 K 3,034 K
Discovered 2024 via radial velocity · 12 light-years away Source: NASA Exoplanet Archive Browse all 5,568 real exoplanets Learn more about exoplanets