:INFO
Terrestrial around TOI-700
It is 1.07 times Earth's radius, closest in size to Earth. A year there lasts 37.42 days, on an orbit 2 times closer to its star than Mercury is to the Sun. Its equilibrium temperature is 245 K (derived from the star rather than measured), in the range where liquid water is possible. The host star TOI-700 runs at 3459 K with 0.41 times the Sun's mass.

:CHECKLIST
What this planet has and has not got
[ ] Inside the habitable zone, computed from the star's luminosity. Yes.
[ ] A measured mass, not just a radius. No.
[ ] A measured temperature rather than one derived from the star. No.
[ ] Any detection of an atmosphere. Not recorded in the archive.

:JOURNEY
TOI-700 from the inside out
1 0.068 AU
2 0.093 AU
3 0.134 AU
4 0.163 AU

:STATS
[icon:TARGET] Radius | 1.07 Earth radii
[icon:FIRE] Equilibrium temperature | 245 K (derived)
[icon:CLOCK] One year | 37.42 days
[icon:BOLT] Orbit radius | 0.1633 AU
[icon:STAR] Host star | TOI-700 at 3459 K
[icon:USERS] Distance | 102 light-years
[icon:TRENDING_DOWN] Starlight blocked | 0.054% at each transit

:PATH
What you get from the shadow
The fraction of starlight blocked sets the radius against the star's.

:TIMELINE
🔭🪐📅
2020-01-01 | TOI-700 b, TOI-700 c, TOI-700 d
2023-01-01 | TOI-700 e

:NOTE
The archive lists no measured equilibrium temperature for this planet. The 245 K quoted here is derived from the star's output and the orbital distance, assuming a third of the light is reflected. It is an estimate from two numbers, not an observation.

:NOTE.half
A transit is a silhouette. It gives a width and says nothing about how heavy the thing casting it is, so this planet has no mass on record.

:NOTE.half
TOI-700 has 4 known planets. Systems like this are the ones where architecture can be studied instead of guessed at.

:NOTE
Found by Transiting Exoplanet Survey Satellite (TESS) in 2020. TESS scans most of the sky in 27-day stretches, so it favours bright nearby stars and short orbits over the faint distant ones Kepler specialised in.

:THREAD

:LINK
https://exoplanetarchive.ipac.caltech.edu/overview/TOI-700%20d
NASA Exoplanet Archive: source data, including the values not used here