TOI-2084 b
TOI-2084 b is a mini-Neptune orbiting the M2+/-0.5 star TOI-2084 in the constellation Draco. It lies about 374 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is TOI-2084 b?
TOI-2084 b has a radius of 2.47 times that of Earth.
Is TOI-2084 b in the Habitable Zone?
TOI-2084 b orbits inside the inner edge of the habitable zone of TOI-2084. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-2084: 0.147–0.380 AU (conservative: 0.186–0.360 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-2084 b
The equilibrium temperature of TOI-2084 b is about 527 K (254 °C) — hotter than anywhere on Earth. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C. It receives 12.80 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-2084 b — one full orbit around TOI-2084 — lasts 6.08 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.050 AU — closer to its star than Mercury is to the Sun.
How Was TOI-2084 b Discovered?
TOI-2084 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-2084 b?
TOI-2084 b is 373.6 light-years (114.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1653. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 6,575,360 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-2084 b scores 0.32, ranking #969 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-2084
TOI-2084 b belongs to a system of 2 stars; it orbits TOI-2084.
TOI-2084
- Spectral type
- M2+/-0.5
- Surface temperature
- 3,551 K (Sun: 5,772 K)
- Mass
- 0.45 M☉
- Radius
- 0.48 R☉
- Luminosity
- 0.0322 L☉
- Age
- 7.5 billion years (Sun: 4.6)
Planetary System
TOI-2084 b is the only planet known to orbit TOI-2084 so far.
TOI-2084 b — Complete Data
| Radius | 2.470 Earth radii (0.220 Jupiter radii) |
|---|---|
| Orbital period | 6.08 days |
| Orbital distance | 0.050 AU |
| Equilibrium temperature | 527 K (254 °C) |
| Stellar irradiation | 12.80× Earth |
| Earth Similarity Index | 0.32 |
| Distance from Earth | 373.6 light-years (114.5 parsecs) |
| Constellation | Draco |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2023-07-25. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2084 b
Is TOI-2084 b habitable?
No — TOI-2084 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-2084 b?
TOI-2084 b is about 374 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 6,575,360 years to get there.
How big is TOI-2084 b compared to Earth?
TOI-2084 b has 2.47 times the radius of Earth.
How long is a year on TOI-2084 b?
One orbit around TOI-2084 takes 6.1 Earth days — short enough that 60 of its years would fit into one Earth year.
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