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Entering orbit…
Habitability
44/ 100
Marginal

GJ 1002 b

Rocky TerrestrialMarginal16 light years awayFound 2022

GJ 1002 b, from the NASA Exoplanet Archive (found 2022). Measured: 1.08 Earth masses, 0.0457 AU, a 3024 K M-type star. Composition inferred from a measured bulk density of 0.99x Earth's, which is rock and iron, with a day locked to its 10.3-day year, as anything orbiting this close would be.

Host star

GJ 1002

Type
M-type (Red Dwarf)
Spectral type
M5.5 V
Temperature
3,024 K
Radius
0.137 ☉
Mass
0.12 ☉
Known planets
2, including this one
Luminosity
1.41e-3 ☉

Published by the NASA Exoplanet Archive. This world’s temperature and habitability score are computed from this star’s measured luminosity, not from a stand-in for its class.

Rocky Terrestrial

Life DetectedModerate Activity
Why is this a Rocky Terrestrial?Your planet is dominated by silicate (25.0%) and iron (12.5%) 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.
Classification Criteria:
✓ Silicon: 25.0% + Iron: 12.5% + Magnesium: 3.8%✓ Mass: 1.1x Earth (terrestrial range)
Further reading
The Little Book of ExoplanetsJoshua WinnHow these worlds are found, and what a measurement can honestly tell us.Exoplanets: Diamond Worlds, Super Earths, Pulsar PlanetsMichael Summers & James TrefilThe strange end of the catalogue — carbon worlds, molten rock, planets orbiting dead stars.Envisioning ExoplanetsMichael CarrollWhat these worlds might look like from the ground, painted from the same measurements this page renders.Imagined LifeJames Trefil & Michael SummersWhat could live on a world like this one: ice shells, supergravity, tidally locked twilight.
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Habitability ScoreMarginal
44
Contributing Factors
temperature70
Challenging but potentially habitable temperature
atmosphere42
Nitrogen atmosphere provides protection but not breathable (partially stripped by slow rotation)
water43
Limited water content - mostly frozen
magnetic Field30
No magnetic field - vulnerable to solar radiation
geology90
Active geology recycles nutrients and drives carbon cycle
Organic Chemistry80
Core organic elements (CHNO) present
rotation30
Very slow rotation - severe temperature swings between eternal day and night sides

Physical Properties

Mass
1.08x Earth (6.45e+24 kg)
Radius
1.03x Earth (6,537 km)
This planet: 1.03× Earth radiusEarth: 1× (baseline)
Surface Gravity
1.03x Earth (10.1 m/s²)
Surface Temperature
256 K (-17 °C / 1 °F)
Rotation Period
247.2 hours/day (slower than Earth)
This planet: 247 h/dayEarth: 24 h/day

Orbital Environment

Star Type
M-type (Red Dwarf)
Distance from Star
0.05 AU (6.84 million km)
Orbital Period
7 days

Atmosphere

Thin CO₂ and nitrogen atmosphere

Elemental Composition

O - Oxygen
31.3%
Si - Silicon
25.0%
Fe - Iron
12.5%

Surface Characteristics

Rocky surface with impact craters, possible volcanic features

Habitability

✓ Conditions suitable for life detectedThis planet exhibits the necessary conditions to support biological processes, including stable temperatures, liquid water, and protective magnetic fields.
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