TOI-4600 c
TOI-4600 c is a cold gas giant orbiting the K V star TOI-4600 in the constellation Draco. It lies about 705 light-years from Earth and was discovered in 2023 using the transit method. It orbits within the habitable zone of its star — the region where liquid water could exist on a planet's surface.
How Big Is TOI-4600 c?
TOI-4600 c has a radius of 9.42 times that of Earth, or 0.84 times the radius of Jupiter. Its mass is 2,946 times that of Earth.
Is TOI-4600 c in the Habitable Zone?
TOI-4600 c orbits within the optimistic habitable zone of TOI-4600 — the broader region where liquid water might be possible under favorable atmospheric conditions.
Habitable zone of TOI-4600: 0.503–1.209 AU (conservative: 0.638–1.146 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-4600 c
The equilibrium temperature of TOI-4600 c is about 191 K (-82 °C) — well below freezing. 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-4600 c — one full orbit around TOI-4600 — lasts 482.8 Earth days, longer than an Earth year. It orbits at an average distance of 1.152 AU. Its orbit is mildly elliptical (eccentricity 0.21).
How Was TOI-4600 c Discovered?
TOI-4600 c was discovered in 2023 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-4600 c?
TOI-4600 c is 704.7 light-years (216.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1322. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 12,402,720 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-4600 c scores 0.32, ranking #981 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-4600
TOI-4600
- Spectral type
- K V
- Surface temperature
- 5,170 K (Sun: 5,772 K)
- Mass
- 0.89 M☉
- Radius
- 0.81 R☉
- Luminosity
- 0.4200 L☉
- Age
- 2.3 billion years (Sun: 4.6)
The TOI-4600 Planetary System
TOI-4600 c is one of 2 known planets in the TOI-4600 system. Its siblings:
- TOI-4600 b (Cold Gas Giant)
TOI-4600 c — Complete Data
| Radius | 9.420 Earth radii (0.841 Jupiter radii) |
|---|---|
| Mass | 2,946.27 Earth masses (9.270 Jupiter masses) |
| Orbital period | 482.82 days |
| Orbital distance | 1.152 AU |
| Eccentricity | 0.210 |
| Equilibrium temperature | 191 K (-82 °C) |
| Earth Similarity Index | 0.32 |
| Distance from Earth | 704.7 light-years (216.1 parsecs) |
| Constellation | Draco |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2023-09-19. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-4600 c
Is TOI-4600 c habitable?
TOI-4600 c orbits within the habitable zone of TOI-4600, the region where liquid water could exist on a planet's surface. Whether it is actually habitable depends on its atmosphere and composition, which remain unknown.
How far away is TOI-4600 c?
TOI-4600 c is about 705 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 12,402,720 years to get there.
How big is TOI-4600 c compared to Earth?
TOI-4600 c has 9.42 times the radius of Earth and about 2,946 times its mass.
How long is a year on TOI-4600 c?
One orbit around TOI-4600 takes 482.8 Earth days.
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