TOI-1408 c
TOI-1408 c is a super-Earth orbiting the F8 V star TOI-1408 in the constellation Cepheus. It lies about 455 light-years from Earth and was discovered in 2024 using the transit timing variations method.
How Big Is TOI-1408 c?
TOI-1408 c has a radius of 2.22 times that of Earth. Its mass is 7.6 times that of Earth, giving it a density of 3.80 g/cm³ — between that of rocky and gaseous planets.
Is TOI-1408 c in the Habitable Zone?
TOI-1408 c orbits inside the inner edge of the habitable zone of TOI-1408. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1408: 1.265–2.956 AU (conservative: 1.602–2.803 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 ›
Orbit and Year Length
A year on TOI-1408 c — one full orbit around TOI-1408 — lasts 2.17 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.036 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.14).
How Was TOI-1408 c Discovered?
TOI-1408 c was discovered in 2024 using the transit timing variations method, with observations from Transiting Exoplanet Survey Satellite (TESS).
Transit timing variations reveal a planet through its gravitational tug on a sibling planet, which makes that sibling's transits arrive slightly early or late. The pattern of these deviations betrays the hidden planet's mass and orbit.
How Far Away Is TOI-1408 c?
TOI-1408 c is 454.9 light-years (139.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1572. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 8,006,240 years to make the journey.
The Host Star: TOI-1408
TOI-1408
- Spectral type
- F8 V
- Surface temperature
- 6,117 K (Sun: 5,772 K)
- Mass
- 1.31 M☉
- Radius
- 1.53 R☉
- Luminosity
- 2.9600 L☉
- Age
- 2.7 billion years (Sun: 4.6)
The TOI-1408 Planetary System
TOI-1408 c is one of 2 known planets in the TOI-1408 system. Its siblings:
- TOI-1408 b (Hot Jupiter)
TOI-1408 c — Complete Data
| Radius | 2.220 Earth radii (0.198 Jupiter radii) |
|---|---|
| Mass | 7.60 Earth masses (0.024 Jupiter masses) |
| Density | 3.80 g/cm³ (Earth: 5.51) |
| Orbital period | 2.17 days |
| Orbital distance | 0.036 AU |
| Eccentricity | 0.135 |
| Distance from Earth | 454.9 light-years (139.5 parsecs) |
| Constellation | Cepheus |
| Discovery method | Transit Timing Variations |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-08-07. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1408 c
Is TOI-1408 c habitable?
No — TOI-1408 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1408 c?
TOI-1408 c is about 455 light-years from Earth in the constellation Cepheus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 8,006,240 years to get there.
How big is TOI-1408 c compared to Earth?
TOI-1408 c has 2.22 times the radius of Earth and about 7.6 times its mass.
How long is a year on TOI-1408 c?
One orbit around TOI-1408 takes 2.2 Earth days — short enough that 169 of its years would fit into one Earth year.
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