TOI-1338 b
TOI-1338 b is a cold gas giant orbiting TOI-1338 A in the constellation Pictor. It lies about 1,301 light-years from Earth and was discovered in 2020 using the transit method.
How Big Is TOI-1338 b?
TOI-1338 b has a radius of 7.66 times that of Earth, or 0.68 times the radius of Jupiter. Its mass is 11.3 times that of Earth.
Is TOI-1338 b in the Habitable Zone?
The position of TOI-1338 b relative to the habitable zone of TOI-1338 A cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on TOI-1338 b — one full orbit around TOI-1338 A — lasts 95.4 Earth days, between the years of Mercury (88 days) and Earth (365 days). Its orbit is nearly circular (eccentricity 0.033).
How Was TOI-1338 b Discovered?
TOI-1338 b was discovered in 2020 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-1338 b?
TOI-1338 b is 1,301.4 light-years (399.0 parsecs) from Earth. Light arriving here tonight left the planet about 1,301 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 22,904,640 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-1338 b scores 0.22, ranking #3,698 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-1338 A
TOI-1338 b is a circumbinary planet — it orbits around two stars at once, like Tatooine in Star Wars.
TOI-1338 A
- Mass
- 1.09 M☉
- Radius
- 1.31 R☉
The TOI-1338 A Planetary System
TOI-1338 b is one of 2 known planets in the TOI-1338 A system. Its siblings:
- TOI-1338 c (Cold Gas Giant)
TOI-1338 b — Complete Data
| Radius | 7.661 Earth radii (0.684 Jupiter radii) |
|---|---|
| Mass | 11.30 Earth masses (0.036 Jupiter masses) |
| Orbital period | 95.40 days |
| Eccentricity | 0.033 |
| Earth Similarity Index | 0.22 |
| Distance from Earth | 1,301.4 light-years (399.0 parsecs) |
| Constellation | Pictor |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2020 |
Data: NASA Exoplanet Archive, last updated 2024-08-07. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1338 b
Is TOI-1338 b habitable?
TOI-1338 b is not known to orbit within the habitable zone of TOI-1338 A, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is TOI-1338 b?
TOI-1338 b is about 1,301 light-years from Earth in the constellation Pictor. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 22,904,640 years to get there.
How big is TOI-1338 b compared to Earth?
TOI-1338 b has 7.66 times the radius of Earth and about 11.3 times its mass.
How long is a year on TOI-1338 b?
One orbit around TOI-1338 A takes 95.4 Earth days.
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