TOI-700 e
Planet· orbits TOI-700
TOI-700 e — a second Earth-size planet (0.95 Earth radii) in the habitable zone, on a 28-day orbit between c and d. Its size is measured; its mass is size-estimated, so no density is quoted. Its discovery made TOI-700 a rare system with two temperate Earth-size worlds. Never imaged.
Open in 3D viewSee TOI-700 e in the live, interactive 3D map
Key facts
Radius
6,072 km
95% of Earth's radius
Year
27.81 Earth days
Distance from TOI-700
0.134 AU
Science
Physical
- Radius
- 6,072 km · 95% of Earth's radius
Orbital
- Semi-major axis
- 0.134 AU
- From the NASA Exoplanet Archive (transit + orbit fit); a 2026 preprint (Pass et al., arXiv:2604.05235 — JWST+TESS+Spitzer) reports more precise ephemerides, pending peer review
- Eccentricity
- 0
- From the NASA Exoplanet Archive (transit + orbit fit); a 2026 preprint (Pass et al., arXiv:2604.05235 — JWST+TESS+Spitzer) reports more precise ephemerides, pending peer review
- Inclination
- 0.00 °
- From the NASA Exoplanet Archive (transit + orbit fit); a 2026 preprint (Pass et al., arXiv:2604.05235 — JWST+TESS+Spitzer) reports more precise ephemerides, pending peer review
- Orbital period
- 27.8 days
- From the NASA Exoplanet Archive (transit + orbit fit); a 2026 preprint (Pass et al., arXiv:2604.05235 — JWST+TESS+Spitzer) reports more precise ephemerides, pending peer review
- Perihelion
- 0.134 AU
- Computed from the orbital elements
- Aphelion
- 0.134 AU
- Computed from the orbital elements
- Mean orbital velocity
- 52.4 km/s
- Computed from the orbital elements
Composition
- Bulk composition
- An Earth-size planet (0.95 Earth radii) in the habitable zone, between c and d; its size is measured, its mass only size-estimated, so no density is quoted. Its discovery made TOI-700 a rare system with two temperate Earth-size worlds. Never imaged.
- Surface appearance
- Appearance based on NASA/JPL-Caltech's artist's concept. No spacecraft has imaged this world, so its real appearance is unknown — The surface shown is an artistic representation, shown only in Visual mode; Realism shows a plain spectral colour.
Radiation & temperature
- Insolation
- 1.27 S⊕ · 1.27× the sunlight Earth receives
- Computed from TOI-700's luminosity and the orbital distance (inverse-square; Earth's sunlight = 1).
- Equilibrium temperature
- 273 K (-0 °C)
- Computed model value for its 28-day habitable-zone orbit — not measured.
Discovery & history
- Method
- Transit detection
- Name
- Designated 'e' under the IAU convention that letters a star's planets 'b', 'c', 'd'... in the order they are found (the star is the unwritten 'a'); no IAU proper name has been assigned.
Announced in 2023 from extended TESS observations, adding a second habitable-zone Earth-size planet to the system.
Images
Images from open archives · credit shown per image