TOI-905 b
TOI-905 b is a hot Jupiter orbiting TOI-905 in the constellation Apus. It lies about 517 light-years from Earth and was discovered in 2020 using the transit method.
How Big Is TOI-905 b?
TOI-905 b has a radius of 13.13 times that of Earth, or 1.17 times the radius of Jupiter. Its mass is 212 times that of Earth, giving it a density of 0.52 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-905 b in the Habitable Zone?
TOI-905 b orbits inside the inner edge of the habitable zone of TOI-905. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-905: 0.649–1.538 AU (conservative: 0.822–1.459 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 ›
Temperature on TOI-905 b
The equilibrium temperature of TOI-905 b is about 1,192 K (919 °C) — hot enough to melt many metals. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C. It receives 337 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-905 b — one full orbit around TOI-905 — lasts 3.74 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.047 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.024).
How Was TOI-905 b Discovered?
TOI-905 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-905 b?
TOI-905 b is 517.4 light-years (158.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1509. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 9,106,240 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-905 b scores 0.07, ranking #4,912 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-905
TOI-905
- Surface temperature
- 5,570 K (Sun: 5,772 K)
- Mass
- 0.97 M☉
- Radius
- 0.92 R☉
- Luminosity
- 0.7300 L☉
- Age
- 3.4 billion years (Sun: 4.6)
Planetary System
TOI-905 b is the only planet known to orbit TOI-905 so far.
TOI-905 b — Complete Data
| Radius | 13.126 Earth radii (1.171 Jupiter radii) |
|---|---|
| Mass | 211.99 Earth masses (0.667 Jupiter masses) |
| Density | 0.52 g/cm³ (Earth: 5.51) |
| Orbital period | 3.74 days |
| Orbital distance | 0.047 AU |
| Eccentricity | 0.024 |
| Equilibrium temperature | 1,192 K (919 °C) |
| Stellar irradiation | 337.00× Earth |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 517.4 light-years (158.6 parsecs) |
| Constellation | Apus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2020 |
Data: NASA Exoplanet Archive, last updated 2021-02-08. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-905 b
Is TOI-905 b habitable?
No — TOI-905 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-905 b?
TOI-905 b is about 517 light-years from Earth in the constellation Apus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 9,106,240 years to get there.
How big is TOI-905 b compared to Earth?
TOI-905 b has 13.13 times the radius of Earth and about 212 times its mass.
How long is a year on TOI-905 b?
One orbit around TOI-905 takes 3.7 Earth days — short enough that 98 of its years would fit into one Earth year.
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