TOI-1470 b
TOI-1470 b is a super-Earth orbiting the M1.5 V star TOI-1470 in the constellation Cassiopeia. It lies about 169 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is TOI-1470 b?
TOI-1470 b has a radius of 2.18 times that of Earth. Its mass is 7.3 times that of Earth, giving it a density of 3.86 g/cm³ — between that of rocky and gaseous planets.
Is TOI-1470 b in the Habitable Zone?
TOI-1470 b orbits inside the inner edge of the habitable zone of TOI-1470. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1470: 0.158–0.406 AU (conservative: 0.200–0.385 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-1470 b
The equilibrium temperature of TOI-1470 b is about 734 K (461 °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 46.30 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-1470 b — one full orbit around TOI-1470 — lasts 2.53 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.029 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.30), swinging dramatically closer to and farther from its star.
How Was TOI-1470 b Discovered?
TOI-1470 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-1470 b?
TOI-1470 b is 169.4 light-years (52.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1857. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,981,440 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-1470 b scores 0.27, ranking #2,524 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-1470
TOI-1470
- Spectral type
- M1.5 V
- Surface temperature
- 3,709 K (Sun: 5,772 K)
- Mass
- 0.47 M☉
- Radius
- 0.47 R☉
- Luminosity
- 0.0376 L☉
- Age
- 1.3 billion years (Sun: 4.6)
The TOI-1470 Planetary System
TOI-1470 b is one of 2 known planets in the TOI-1470 system. Its siblings:
- TOI-1470 c (Mini Neptune)
TOI-1470 b — Complete Data
| Radius | 2.180 Earth radii (0.194 Jupiter radii) |
|---|---|
| Mass | 7.32 Earth masses (0.023 Jupiter masses) |
| Density | 3.86 g/cm³ (Earth: 5.51) |
| Orbital period | 2.53 days |
| Orbital distance | 0.029 AU |
| Eccentricity | 0.300 |
| Equilibrium temperature | 734 K (461 °C) |
| Stellar irradiation | 46.30× Earth |
| Earth Similarity Index | 0.27 |
| Distance from Earth | 169.4 light-years (52.0 parsecs) |
| Constellation | Cassiopeia |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2023-08-07. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1470 b
Is TOI-1470 b habitable?
No — TOI-1470 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1470 b?
TOI-1470 b is about 169 light-years from Earth in the constellation Cassiopeia. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,981,440 years to get there.
How big is TOI-1470 b compared to Earth?
TOI-1470 b has 2.18 times the radius of Earth and about 7.3 times its mass.
How long is a year on TOI-1470 b?
One orbit around TOI-1470 takes 2.5 Earth days — short enough that 145 of its years would fit into one Earth year.
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