TOI-1669 c
TOI-1669 c is a super-Earth orbiting TOI-1669 in the constellation Cepheus. It lies about 363 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-1669 c?
TOI-1669 c has a radius of 2.30 times that of Earth. Its mass is 13.0 times that of Earth, giving it a density of 6.00 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is TOI-1669 c in the Habitable Zone?
TOI-1669 c orbits inside the inner edge of the habitable zone of TOI-1669. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1669: 0.732–1.739 AU (conservative: 0.927–1.649 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-1669 c
The equilibrium temperature of TOI-1669 c is about 1,285 K (1,012 °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-1669 c — one full orbit around TOI-1669 — lasts 2.68 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.038 AU — closer to its star than Mercury is to the Sun.
How Was TOI-1669 c Discovered?
TOI-1669 c 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-1669 c?
TOI-1669 c is 362.9 light-years (111.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1664. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 6,387,040 years to make the journey.
The Host Star: TOI-1669
TOI-1669
- Surface temperature
- 5,497 K (Sun: 5,772 K)
- Mass
- 0.99 M☉
- Radius
- 1.06 R☉
- Luminosity
- 0.9210 L☉
- Age
- 7.7 billion years (Sun: 4.6)
The TOI-1669 Planetary System
TOI-1669 c is one of 2 known planets in the TOI-1669 system. Its siblings:
- TOI-1669 b (Cold Gas Giant)
TOI-1669 c — Complete Data
| Radius | 2.296 Earth radii (0.205 Jupiter radii) |
|---|---|
| Mass | 13.00 Earth masses (0.041 Jupiter masses) |
| Density | 6.00 g/cm³ (Earth: 5.51) |
| Orbital period | 2.68 days |
| Orbital distance | 0.038 AU |
| Equilibrium temperature | 1,285 K (1,012 °C) |
| Distance from Earth | 362.9 light-years (111.3 parsecs) |
| Constellation | Cepheus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-07-22. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1669 c
Is TOI-1669 c habitable?
No — TOI-1669 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1669 c?
TOI-1669 c is about 363 light-years from Earth in the constellation Cepheus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 6,387,040 years to get there.
How big is TOI-1669 c compared to Earth?
TOI-1669 c has 2.30 times the radius of Earth and about 13.0 times its mass.
How long is a year on TOI-1669 c?
One orbit around TOI-1669 takes 2.7 Earth days — short enough that 136 of its years would fit into one Earth year.
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