TOI-1533 c
TOI-1533 c is a hot Jupiter orbiting TOI-1533 in the constellation Cassiopeia. It lies about 326 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-1533 c?
TOI-1533 c has a radius of 7.50 times that of Earth, or 0.67 times the radius of Jupiter. Its mass is 36.6 times that of Earth, giving it a density of 0.48 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-1533 c in the Habitable Zone?
TOI-1533 c orbits inside the inner edge of the habitable zone of TOI-1533. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1533: 0.522–1.254 AU (conservative: 0.661–1.189 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-1533 c — one full orbit around TOI-1533 — lasts 8.06 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.076 AU — closer to its star than Mercury is to the Sun.
How Was TOI-1533 c Discovered?
TOI-1533 c was discovered in 2026 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-1533 c?
TOI-1533 c is 326.3 light-years (100.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1700. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 5,742,880 years to make the journey.
The Host Star: TOI-1533
TOI-1533
- Surface temperature
- 5,146 K (Sun: 5,772 K)
- Mass
- 0.88 M☉
- Radius
- 0.85 R☉
- Luminosity
- 0.4500 L☉
- Age
- 6.9 billion years (Sun: 4.6)
The TOI-1533 Planetary System
TOI-1533 c is one of 2 known planets in the TOI-1533 system. Its siblings:
- TOI-1533 b (Super Earth)
TOI-1533 c — Complete Data
| Radius | 7.500 Earth radii (0.669 Jupiter radii) |
|---|---|
| Mass | 36.60 Earth masses (0.115 Jupiter masses) |
| Density | 0.48 g/cm³ (Earth: 5.51) |
| Orbital period | 8.06 days |
| Orbital distance | 0.076 AU |
| Distance from Earth | 326.3 light-years (100.1 parsecs) |
| Constellation | Cassiopeia |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-07-16. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1533 c
Is TOI-1533 c habitable?
No — TOI-1533 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1533 c?
TOI-1533 c is about 326 light-years from Earth in the constellation Cassiopeia. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 5,742,880 years to get there.
How big is TOI-1533 c compared to Earth?
TOI-1533 c has 7.50 times the radius of Earth and about 36.6 times its mass.
How long is a year on TOI-1533 c?
One orbit around TOI-1533 takes 8.1 Earth days — short enough that 45 of its years would fit into one Earth year.
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