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Entering orbit…
Habitability
42/ 100
Marginal
LTT 1445 Ad rendered in TerraForge from its measured mass, orbit and star

LTT 1445 Ad

Rocky TerrestrialMarginal22 light years awayFound 2022
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

LTT 1445 Ad, from the Extrasolar Planets Encyclopaedia (found 2022). Measured: 2.72 Earth masses, 0.09 AU, a 3340 K M-type star. Composition inferred from an estimated bulk density of 0.87x 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 a day locked to its 24.3-day year, as anything orbiting this close would be.

Host star

LTT 1445 A

Type
M-type (Red Dwarf)
Spectral type
M3.5V
Temperature
3,340 K
Radius
0.27 ☉
Mass
0.256 ☉
Known planets
3, including this one
Luminosity
8.17e-3 ☉

Published by the Extrasolar Planets Encyclopaedia. This world’s temperature and habitability score are computed from its star’s published radius and temperature.

Rocky Terrestrial

Life possibleHigh Activity
Why is this a Rocky Terrestrial?
LTT 1445 Ad 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: 2.7x Earth (terrestrial range)

Reading LTT 1445 Ad’s atmosphere

Dominant elements: O, Si, Fe, N, C, HThis is what a telescope would measure while LTT 1445 Ad 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.LTT 1445 Ad sits about 23 light-years away, found by the radial velocity 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.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.
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Habitability ScoreMarginal
42
Contributing Factors
temperature100
Optimal temperature range for liquid water and life
atmosphere28
Nitrogen atmosphere provides protection but not breathable (partially stripped by slow rotation)
water50
Limited water content
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
rotation10
Near tidally locked - one hemisphere perpetually scorched, other frozen, narrow habitable twilight zone only

Physical Properties

Mass
2.72x Earth (1.62e+25 kg)
Radius
1.40x Earth (8,893 km)
This planet: 1.40× Earth radiusEarth: 1× (baseline)
Surface Gravity
1.40x Earth (13.7 m/s²)
Surface Temperature
283 K (10 °C / 49 °F)
Rotation Period
583.2 hours/day (slower than Earth)
This planet: 583 h/dayEarth: 24 h/day

Orbital Environment

Star Type
M-type (Red Dwarf)
Distance from Star
0.09 AU (13.5 million km)
Orbital Period
18 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 could support lifeThis planet’s modelled conditions could support biological processes: stable temperatures, liquid water and the chemistry life as we know it needs. That makes life possible, not present.
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A dark ringed planet hanging over the horizon of a rocky moon, its rings lit by a distant sun

New: Stand on Your Moons 🌒

A planet's surface view isn't the only ground any more. Press the surface button on a planet with moons and it asks where to stand: the planet itself, or any moon still in orbit, each tagged with what it became — ocean, ice, carbon, volcanic. Every moon gets its own ground and sky from its own physics: airless rock under a black sky, ice cracked by geysers over a hidden sea, sulfur plains shaking with eruptions, or orange haze you can't see the sun through. And hanging over the horizon, there's the planet you built.

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