TOI-1694 c
TOI-1694 c is a cold gas giant orbiting TOI-1694 in the constellation Camelopardalis. It lies about 407 light-years from Earth and was discovered in 2023 using the radial velocity method.
Is TOI-1694 c in the Habitable Zone?
TOI-1694 c orbits inside the inner edge of the habitable zone of TOI-1694. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1694: 0.483–1.165 AU (conservative: 0.611–1.104 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-1694 c — one full orbit around TOI-1694 — lasts 393.1 Earth days, longer than an Earth year. It orbits at an average distance of 0.100 AU — closer to its star than Mercury is to the Sun.
How Was TOI-1694 c Discovered?
TOI-1694 c was discovered in 2023 using the radial velocity method, with observations from W. M. Keck Observatory.
The radial velocity method measures the subtle wobble of a star caused by the gravitational pull of an orbiting planet, visible as periodic shifts in the star's light spectrum. The size of the wobble reveals the planet's minimum mass.
How Far Away Is TOI-1694 c?
TOI-1694 c is 406.7 light-years (124.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1620. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 7,157,920 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-1694 c scores 0.32, ranking #1,002 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-1694
TOI-1694
- Surface temperature
- 5,058 K (Sun: 5,772 K)
- Mass
- 0.85 M☉
- Radius
- 0.80 R☉
- Luminosity
- 0.3820 L☉
- Age
- 4.3 billion years (Sun: 4.6)
The TOI-1694 Planetary System
TOI-1694 c is one of 2 known planets in the TOI-1694 system. Its siblings:
- TOI-1694 b (Neptune-like)
TOI-1694 c — Complete Data
| Mass (best estimate) | 297.00 Earth masses |
|---|---|
| Orbital period | 393.10 days |
| Orbital distance | 0.100 AU |
| Earth Similarity Index | 0.32 |
| Distance from Earth | 406.7 light-years (124.7 parsecs) |
| Constellation | Camelopardalis |
| Discovery method | Radial Velocity |
| Discovery facility | W. M. Keck Observatory |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2024-07-22. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1694 c
Is TOI-1694 c habitable?
No — TOI-1694 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1694 c?
TOI-1694 c is about 407 light-years from Earth in the constellation Camelopardalis. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 7,157,920 years to get there.
How long is a year on TOI-1694 c?
One orbit around TOI-1694 takes 393.1 Earth days.
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