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Entering orbit…
Habitability
19/ 100
Uninhabitable
KMT-2023-BLG-1746 b rendered in TerraForge from its measured mass, orbit and star

KMT-2023-BLG-1746 b

Also written KMT-2023-BLG-1746b, KMT 2023 BLG 1746b, KMT 2023 BLG 1746 b

Ice WorldUninhabitable25363 light years awayFound 2026
exoplanet.euListed by the Extrasolar Planets Encyclopaedia; not yet in NASA's confirmed catalogue.View on exoplanet.eu

Estimated: this planet doesn't transit its star, so its size is inferred, not measured

KMT-2023-BLG-1746 b, from the Extrasolar Planets Encyclopaedia (found 2026). Measured: 2.23 Earth masses, 1.06 AU, a 3200 K M-type star. Composition inferred from an estimated bulk density of 1.02x Earth's, modeled rather than measured since this isn't a transiting planet — the radius is the archive's estimate, so it can't settle how much water there is; read as rock and iron, with an assumed 24-hour day — rotation cannot be measured for exoplanets.

Host star

KMT-2023-BLG-1746

Type
M-type (Red Dwarf)
Spectral type
M7V
Temperature
3,200 K
Mass
0.11 ☉
Known planets
1 (this one)

Published by the Extrasolar Planets Encyclopaedia. This star’s luminosity has not been published, so this world’s temperature and habitability score fall back to a typical M-type star.

Ice World

Life unlikely — too cold for liquid waterMagnetic FieldLow Activity
Why is this a Ice World?
KMT-2023-BLG-1746 b orbits at 1.06 AU from its star, resulting in frigid temperatures of 123K.
Ice worlds form beyond the frost line where temperatures are low enough for water and other volatiles to freeze solid. They may have subsurface oceans beneath thick ice shells.
Classification Criteria:
✓ Distance: 1.06 AU (>3 AU) or Temperature <200K✓ Temperature: 123K✓ Water content: 34.4% for ice formation

Reading KMT-2023-BLG-1746 b’s atmosphere

Dominant elements: O, Si, Fe, N, C, HThis is what a telescope would measure while KMT-2023-BLG-1746 b crosses in front of its star: starlight passes through the atmosphere and spreads into a rainbow band. Each dark line marks a wavelength the atmosphere absorbed.Every element absorbs its own signature wavelengths — hydrogen always darkens the same two spots, calcium another pair, and so on. Astronomers match the lines in a real spectrum against a library of these signatures to say what an atmosphere is made of, light-years away, without ever visiting. A deeper line generally means more of that element is present.KMT-2023-BLG-1746 b sits about 25375 light-years away, found by the microlensing method. Most catalogued distances trace back to parallax: as Earth orbits the Sun, a nearby star appears to shift very slightly against the distant background stars, and the size of that shift gives its distance directly.
Further reading
ExoplanetsSara Seager (editor)The field's standard reference: how planets are found, how they form, and what their atmospheres are made of.The Planet FactoryElizabeth TaskerHow planets are made, and why so few of them come out like Earth.Imagined LifeJames Trefil & Michael SummersWhat could live on a world like this one: ice shells, supergravity, tidally locked twilight.Envisioning ExoplanetsMichael CarrollWhat these worlds might look like from the ground, painted from the same measurements this page renders.
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Habitability ScoreUninhabitable
19
Contributing Factors
temperature20
Very cold - water frozen, challenging for life
atmosphere70
Nitrogen atmosphere provides protection but not breathable
water11
Limited water content - frozen solid, no liquid phase at this temperature
magnetic Field100
Magnetic field provides radiation protection
geology60
Some geological activity provides slow nutrient cycling
Organic Chemistry80
Core organic elements (CHNO) present
rotation100
Optimal rotation period - balanced day/night cycle, moderate weather, and good heat distribution

Physical Properties

Mass
2.23x Earth (1.33e+25 kg)
Radius
1.31x Earth (8,324 km)
This planet: 1.31× Earth radiusEarth: 1× (baseline)
Surface Gravity
1.31x Earth (12.8 m/s²)
Surface Temperature
123 K (-151 °C / -239 °F)
Rotation Period
24.0 hours/day
This planet: 24 h/dayEarth: 24 h/day

Orbital Environment

Star Type
M-type (Red Dwarf)
Distance from Star
1.06 AU (159 million km)
Orbital Period
1.99 years

Atmosphere

Thin nitrogen and methane atmosphere

Elemental Composition

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

Surface Characteristics

Frozen surface covered in water ice, possible subsurface ocean if tidal heating present
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