Host star — TOI-700
- Spectral type
- M2.5 V
- Temperature
- 3,459 K
- Radius
- 0.42 R☉
- Mass
- 0.41 M☉
- Luminosity
- 0.023 L☉
- Distance
- 31.1 pc (102 ly)
Red dwarf — the most common type of star. Cool and small.
Very cool — a faint red dwarf.
TOI-700 e
Orbits TOI-700 · 102 light-years from Earth
RockyTransit2023ESI 90 · Very Earth-like
Radius
0.95×
Earth
Mass
0.8×
Earth
Year
28d
Temp
273 K
0°C
Gravity
0.9×
Earth
Distance
102
ly
Could life exist here?
AI analysisTOI-700 e orbits an M-dwarf star just 102 light-years away, making it one of the closest potentially habitable exoplanets known. With a radius of 0.953 Earth radii and a mass of 0.818 Earth masses, this rocky world is a near-perfect Earth analog in size and composition. Its equilibrium temperature of 273 Kelvin—exactly the freezing point of water—places it squarely in the habitable zone, where liquid water could persist on the surface. The planet completes an orbit every 27.8 days at a distance of 0.134 AU from its cool, dim host star, and its low eccentricity suggests a relatively stable climate. However, the extremely slow rotation expected for a planet this close to an M-dwarf likely means one side faces perpetual day while the other endures eternal night, which could severely limit habitability despite the favorable temperature. What makes TOI-700 e exceptional is its remarkable similarity to Earth combined with its discovery via the transit method just last year, offering an exceptional nearby target for future atmospheric study with next-generation telescopes.
What it would be like
TOI-700 e is a rocky world, potentially similar in composition to Earth or Mars — a solid surface you could, in theory, stand on.
Surface gravity is about 0.9g — noticeably lighter what you're used to on Earth.
With an equilibrium temperature around 0°C, this planet sits in the temperature range where liquid water could potentially exist on the surface — a key ingredient for life as we know it.
An orbital period of 28 days makes the year 13.1× shorter than Earth's. You'd celebrate your birthday more often here.
Earth comparison
Logarithmic bars so Jupiter-class planets fit the same scale as Earth-size worlds.
Radius0.95R⊕
1/25×Earth = 125×
Mass0.82M⊕
1/10000×Earth = 110000×
Surface gravity0.90g
1/100×Earth = 1100×
Equilibrium temp273 K(0°C)
0 KEarth 255 K2500 K
Side-by-side with Earth
Temperature in context
Liquid N₂Mars avgEarth eq.Earth sfc.Boiling H₂OVenus
Discovery & orbit
- Method
- Transit
- Year
- 2023
- Facility
- Transiting Exoplanet Survey Satellite (TESS)
- Semi-major axis
- 0.1340 AU
- Period
- 27.81 days
- Eccentricity
- 0.0590
- Density
- 5.19 g/cm³
Detected by measuring the tiny dip in starlight as the planet crosses in front of its star.
Mildly elliptical — similar to most Solar System planets.
Rocky composition likely. Earth is 5.51 g/cm³.
Discovered via · Transit
Tiny dip in starlight as the planet crosses in front of its star
A transit photometer watches a star nonstop and measures its brightness to ~0.01%. When a planet passes between us and the star, the star dims briefly — the deeper the dip, the bigger the planet. This is how Kepler and TESS found most known exoplanets.
- Overall share
- ~75% of all confirmed worlds
- Best for
- Earth-to-Neptune-sized planets on short orbits
Orbital Animation
TOI-700TOI-700 eOrbitHabitable zone
Drag to rotate · scroll to zoomSemi-major axis: 0.134 AUEccentricity: 0.0590Period: 27.8 days
Hertzsprung–Russell Diagram
Where this host star sits among … exoplanet host stars. The main sequence band runs diagonally — giants and supergiants sit above, white dwarfs below.
OBAFGKMCurrent star
How far is 102 light-years?
- A light beam leaving Earth right now would arrive in 102 years.
- At Voyager 1's speed (17 km/s), the trip would take approximately 1.8 million years.
- A radio signal sent today would arrive in 101.5 years — and the reply wouldn't come back for twice that.
Earth Similarity Index
90/1000 — Nothing like Earth100 — Identical to Earth
ESI combines radius similarity and equilibrium temperature similarity. Earth = 100. Mars ≈ 73. Venus ≈ 44. This score reflects two physical parameters only — not atmosphere, water, or magnetic field.