TOI-1347 b
TOI-1347 b is a super-Earth orbiting TOI-1347 in the constellation Draco. It lies about 481 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-1347 b?
TOI-1347 b has a radius of 1.80 times that of Earth. Its mass is 11.1 times that of Earth, giving it a density of 9.90 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is TOI-1347 b in the Habitable Zone?
The position of TOI-1347 b relative to the habitable zone of TOI-1347 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-1347: 0.567–1.348 AU (conservative: 0.718–1.278 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-1347 b
The equilibrium temperature of TOI-1347 b is about 1,400 K (1,127 °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.
Orbit and Year Length
A year on TOI-1347 b — one full orbit around TOI-1347 — lasts just 20.3 hours, shorter than Mercury's 88-day year.
How Was TOI-1347 b Discovered?
TOI-1347 b was discovered in 2024 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-1347 b?
TOI-1347 b is 481.0 light-years (147.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1545. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 8,465,600 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-1347 b scores 0.27, ranking #2,730 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-1347
TOI-1347
- Surface temperature
- 5,464 K (Sun: 5,772 K)
- Mass
- 0.91 M☉
- Radius
- 0.83 R☉
- Luminosity
- 0.5500 L☉
- Age
- 1.4 billion years (Sun: 4.6)
The TOI-1347 Planetary System
TOI-1347 b is one of 2 known planets in the TOI-1347 system. Its siblings:
- TOI-1347 c (Super Earth)
TOI-1347 b — Complete Data
| Radius | 1.800 Earth radii (0.161 Jupiter radii) |
|---|---|
| Mass | 11.10 Earth masses (0.035 Jupiter masses) |
| Density | 9.90 g/cm³ (Earth: 5.51) |
| Orbital period | 0.85 days |
| Equilibrium temperature | 1,400 K (1,127 °C) |
| Earth Similarity Index | 0.27 |
| Distance from Earth | 481.0 light-years (147.5 parsecs) |
| Constellation | Draco |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-03-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1347 b
Is TOI-1347 b habitable?
TOI-1347 b is not known to orbit within the habitable zone of TOI-1347, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is TOI-1347 b?
TOI-1347 b is about 481 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 8,465,600 years to get there.
How big is TOI-1347 b compared to Earth?
TOI-1347 b has 1.80 times the radius of Earth and about 11.1 times its mass.
How long is a year on TOI-1347 b?
One orbit around TOI-1347 takes 0.8 Earth days — short enough that 431 of its years would fit into one Earth year.
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