TOI-5238 b
TOI-5238 b is a Neptune-like planet orbiting TOI-5238 in the constellation Ursa Minor. It lies about 948 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is TOI-5238 b?
TOI-5238 b has a radius of 5.22 times that of Earth.
Is TOI-5238 b in the Habitable Zone?
The position of TOI-5238 b relative to the habitable zone of TOI-5238 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-5238: 0.737–1.743 AU (conservative: 0.933–1.653 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Orbit and Year Length
A year on TOI-5238 b — one full orbit around TOI-5238 — lasts 4.87 Earth days, shorter than Mercury's 88-day year.
How Was TOI-5238 b Discovered?
TOI-5238 b was discovered in 2022 using the transit method, with observations from Transiting Exoplanet Survey Satellite (TESS).
The transit method watches a star for the tiny, regular dip in brightness that occurs when a planet crosses in front of it. The depth and timing of these dips reveal the planet's size and orbital period.
How Far Away Is TOI-5238 b?
TOI-5238 b is 948.0 light-years (290.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1078. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 16,684,800 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. TOI-5238 b scores 0.15, ranking #4,210 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-5238
TOI-5238
- Surface temperature
- 5,631 K (Sun: 5,772 K)
- Mass
- 1.00 M☉
- Radius
- 1.02 R☉
- Luminosity
- 0.9477 L☉
Planetary System
TOI-5238 b is the only planet known to orbit TOI-5238 so far.
TOI-5238 b — Complete Data
| Radius | 5.220 Earth radii (0.466 Jupiter radii) |
|---|---|
| Orbital period | 4.87 days |
| Earth Similarity Index | 0.15 |
| Distance from Earth | 948.0 light-years (290.6 parsecs) |
| Constellation | Ursa Minor |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2022-10-03. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-5238 b
Is TOI-5238 b habitable?
TOI-5238 b is not known to orbit within the habitable zone of TOI-5238, and as a Neptune-like planet it is an unlikely candidate for life as we know it.
How far away is TOI-5238 b?
TOI-5238 b is about 948 light-years from Earth in the constellation Ursa Minor. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 16,684,800 years to get there.
How big is TOI-5238 b compared to Earth?
TOI-5238 b has 5.22 times the radius of Earth.
How long is a year on TOI-5238 b?
One orbit around TOI-5238 takes 4.9 Earth days — short enough that 75 of its years would fit into one Earth year.
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