Gas Giant Magnetic Field Extreme Activity
Why is this a Gas Giant? Your planet has 65.0% hydrogen and helium, combined with a mass of 17.0x Earth, which exceeds the gas giant threshold. Gas giants form when massive cores capture enormous atmospheres of light gases. They typically form beyond the 'frost line' where volatiles can condense.
✓ Hydrogen + Helium: 65.0% (>60% required) ✓ Mass: 17.0x Earth (>10x required)
Habitability Score Uninhabitable
Contributing Factors water 15
No solid surface — any water is locked in a supercritical mantle and hot ice, not oceans geology 40
Extreme volcanic activity may be hazardous rotation 65
Slow rotation - significant day/night temperature variations, but life can adapt Organic Chemistry 84
Core organic elements (CHNO) present (tidal pools cycle wet and dry - a boost for prebiotic chemistry) atmosphere 30
Hydrogen-rich atmosphere typical of gas giants temperature 0
Inferno world - temperatures exceed all possibility of 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
15,633 K (15,360 °C / 27,680 °F) Rotation Period
16.0 hours/day (faster than Earth) This planet: 16 h/day Earth: 24 h/day Orbital Environment Star Type
O-type (Blue Supergiant) Distance from Star
0.10 AU (15 million km) Time Dilation
Clocks run 2.3 minutes per year slower than deep space — about 3.1 hours over a lifetime Atmosphere Hydrogen and helium dominated with trace methane and ammonia
Surface Characteristics No solid surface - thick gaseous envelope with possible rocky core deep within Closest Real Exoplanet Orbiting KMT-2021-BLG-0171L Yours KMT-2021-BLG-0171L b Mass 17.0 × Earth 11.2 × Earth Radius 4.16 × Earth 3.35 × Earth Density (composition) 1.30 g/cm³ 1.64 g/cm³ Temperature 15,633 K — Starlight received 10,000,000 × Earth — Star temperature 35,000 K 5,200 K
Discovered 2022 via microlensing · 15,003 light-years away Source: NASA Exoplanet Archive Browse all 5,568 real exoplanets Learn more about exoplanets Moons
Moon 1 rings 0.00010% - 3.8 radii
Inside the synchronous orbit: it spiraled inward and was torn apart at the Roche limit (Phobos's fate).
Moon 2 stable 0.0028% - 7.0 radii
Small and distant: a quiet, stable companion.
Moon 3 stable 0.010% - 12.2 radii
Small and distant: a quiet, stable companion.
Moon 4 merged 0.010% - 16.7 radii
Merged with an adjacent moon: too close for both to hold a stable orbit.
Moon 5 stable 0.010% - 16.0 radii
Small and distant: a quiet, stable companion.
+4 chemistry: tidal pools cycle wet and dry - a boost for prebiotic chemistry