TOI-1470 c
TOI-1470 c is a mini-Neptune 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 c?
TOI-1470 c has a radius of 2.47 times that of Earth. Its mass is 7.2 times that of Earth, giving it a density of 2.66 g/cm³ — between that of rocky and gaseous planets.
Is TOI-1470 c in the Habitable Zone?
TOI-1470 c 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.
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Temperature on TOI-1470 c
The equilibrium temperature of TOI-1470 c is about 373 K (100 °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 3.35 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-1470 c — one full orbit around TOI-1470 — lasts 18.1 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.106 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.50), swinging dramatically closer to and farther from its star.
How Was TOI-1470 c Discovered?
TOI-1470 c 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 c?
TOI-1470 c 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 c scores 0.49, ranking #267 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 c is one of 2 known planets in the TOI-1470 system. Its siblings:
- TOI-1470 b (Super Earth)
TOI-1470 c — Complete Data
| Radius | 2.470 Earth radii (0.220 Jupiter radii) |
|---|---|
| Mass | 7.24 Earth masses (0.023 Jupiter masses) |
| Density | 2.66 g/cm³ (Earth: 5.51) |
| Orbital period | 18.09 days |
| Orbital distance | 0.106 AU |
| Eccentricity | 0.500 |
| Equilibrium temperature | 373 K (100 °C) |
| Stellar irradiation | 3.35× Earth |
| Earth Similarity Index | 0.49 |
| 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 c
Is TOI-1470 c habitable?
No — TOI-1470 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1470 c?
TOI-1470 c 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 c compared to Earth?
TOI-1470 c has 2.47 times the radius of Earth and about 7.2 times its mass.
How long is a year on TOI-1470 c?
One orbit around TOI-1470 takes 18.1 Earth days — short enough that 20 of its years would fit into one Earth year.
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