TOI-1670 c
TOI-1670 c is a cold gas giant orbiting the F7 V star TOI-1670 in the constellation Draco. It lies about 548 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is TOI-1670 c?
TOI-1670 c has a radius of 11.06 times that of Earth, or 0.99 times the radius of Jupiter. Its mass is 200 times that of Earth, giving it a density of 0.81 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-1670 c in the Habitable Zone?
TOI-1670 c orbits inside the inner edge of the habitable zone of TOI-1670. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1670: 1.100–2.567 AU (conservative: 1.393–2.434 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-1670 c
The equilibrium temperature of TOI-1670 c is about 684 K (411 °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-1670 c — one full orbit around TOI-1670 — lasts 40.7 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.249 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.09).
How Was TOI-1670 c Discovered?
TOI-1670 c was discovered in 2022 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-1670 c?
TOI-1670 c is 548.2 light-years (168.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1478. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 9,648,320 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-1670 c scores 0.10, ranking #4,399 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-1670
TOI-1670
- Spectral type
- F7 V
- Surface temperature
- 6,170 K (Sun: 5,772 K)
- Mass
- 1.21 M☉
- Radius
- 1.32 R☉
- Age
- 2.5 billion years (Sun: 4.6)
The TOI-1670 Planetary System
TOI-1670 c is one of 2 known planets in the TOI-1670 system. Its siblings:
- TOI-1670 b (Super Earth)
TOI-1670 c — Complete Data
| Radius | 11.063 Earth radii (0.987 Jupiter radii) |
|---|---|
| Mass | 200.23 Earth masses (0.630 Jupiter masses) |
| Density | 0.81 g/cm³ (Earth: 5.51) |
| Orbital period | 40.75 days |
| Orbital distance | 0.249 AU |
| Eccentricity | 0.090 |
| Equilibrium temperature | 684 K (411 °C) |
| Earth Similarity Index | 0.10 |
| Distance from Earth | 548.2 light-years (168.1 parsecs) |
| Constellation | Draco |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2022-03-16. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1670 c
Is TOI-1670 c habitable?
No — TOI-1670 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1670 c?
TOI-1670 c is about 548 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 9,648,320 years to get there.
How big is TOI-1670 c compared to Earth?
TOI-1670 c has 11.06 times the radius of Earth and about 200 times its mass.
How long is a year on TOI-1670 c?
One orbit around TOI-1670 takes 40.7 Earth days.
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