TOI-4641 b
TOI-4641 b is a cold gas giant orbiting TOI-4641 in the constellation Aries. It lies about 282 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is TOI-4641 b?
TOI-4641 b has a radius of 8.18 times that of Earth, or 0.73 times the radius of Jupiter. Its mass is 1,230 times that of Earth.
Is TOI-4641 b in the Habitable Zone?
TOI-4641 b orbits inside the inner edge of the habitable zone of TOI-4641. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-4641: 1.593–3.695 AU (conservative: 2.018–3.503 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-4641 b — one full orbit around TOI-4641 — lasts 22.1 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.173 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.07).
How Was TOI-4641 b Discovered?
TOI-4641 b was discovered in 2023 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-4641 b?
TOI-4641 b is 281.6 light-years (86.4 parsecs) from Earth. Light arriving here tonight left the planet around the year 1745. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,956,160 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-4641 b scores 0.11, ranking #4,385 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-4641
TOI-4641
- Surface temperature
- 6,560 K (Sun: 5,772 K)
- Mass
- 1.41 M☉
- Radius
- 1.72 R☉
- Luminosity
- 4.9501 L☉
- Age
- 2.7 billion years (Sun: 4.6)
Planetary System
TOI-4641 b is the only planet known to orbit TOI-4641 so far.
TOI-4641 b — Complete Data
| Radius | 8.183 Earth radii (0.730 Jupiter radii) |
|---|---|
| Mass | 1,230.00 Earth masses (3.870 Jupiter masses) |
| Orbital period | 22.09 days |
| Orbital distance | 0.173 AU |
| Eccentricity | 0.074 |
| Earth Similarity Index | 0.11 |
| Distance from Earth | 281.6 light-years (86.4 parsecs) |
| Constellation | Aries |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2023-12-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-4641 b
Is TOI-4641 b habitable?
No — TOI-4641 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-4641 b?
TOI-4641 b is about 282 light-years from Earth in the constellation Aries. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,956,160 years to get there.
How big is TOI-4641 b compared to Earth?
TOI-4641 b has 8.18 times the radius of Earth and about 1,230 times its mass.
How long is a year on TOI-4641 b?
One orbit around TOI-4641 takes 22.1 Earth days — short enough that 17 of its years would fit into one Earth year.
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