TOI-1064 c
TOI-1064 c is a puffy low-density planet orbiting TOI-1064 in the constellation Telescopium. It lies about 222 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is TOI-1064 c?
TOI-1064 c has a radius of 2.65 times that of Earth. Its mass is 2.5 times that of Earth, giving it a density of 0.77 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-1064 c in the Habitable Zone?
TOI-1064 c orbits inside the inner edge of the habitable zone of TOI-1064. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1064: 0.387–0.945 AU (conservative: 0.490–0.896 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-1064 c
The equilibrium temperature of TOI-1064 c is about 634 K (361 °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. It receives 26.80 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-1064 c — one full orbit around TOI-1064 — lasts 12.2 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.094 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.09).
How Was TOI-1064 c Discovered?
TOI-1064 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-1064 c?
TOI-1064 c is 222.0 light-years (68.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1804. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,907,200 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-1064 c scores 0.27, ranking #2,621 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-1064
TOI-1064
- Surface temperature
- 4,734 K (Sun: 5,772 K)
- Mass
- 0.75 M☉
- Radius
- 0.73 R☉
- Luminosity
- 0.2380 L☉
- Age
- 9.4 billion years (Sun: 4.6)
The TOI-1064 Planetary System
TOI-1064 c is one of 2 known planets in the TOI-1064 system. Its siblings:
- TOI-1064 b (Super Earth)
TOI-1064 c — Complete Data
| Radius | 2.651 Earth radii (0.237 Jupiter radii) |
|---|---|
| Mass | 2.50 Earth masses (0.008 Jupiter masses) |
| Density | 0.77 g/cm³ (Earth: 5.51) |
| Orbital period | 12.23 days |
| Orbital distance | 0.094 AU |
| Eccentricity | 0.088 |
| Equilibrium temperature | 634 K (361 °C) |
| Stellar irradiation | 26.80× Earth |
| Earth Similarity Index | 0.27 |
| Distance from Earth | 222.0 light-years (68.1 parsecs) |
| Constellation | Telescopium |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2022-01-31. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1064 c
Is TOI-1064 c habitable?
No — TOI-1064 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1064 c?
TOI-1064 c is about 222 light-years from Earth in the constellation Telescopium. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,907,200 years to get there.
How big is TOI-1064 c compared to Earth?
TOI-1064 c has 2.65 times the radius of Earth and about 2.5 times its mass.
How long is a year on TOI-1064 c?
One orbit around TOI-1064 takes 12.2 Earth days — short enough that 30 of its years would fit into one Earth year.
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