TOI-530 b
TOI-530 b is a hot Jupiter orbiting the M0.5 V star TOI-530 in the constellation Gemini. It lies about 485 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is TOI-530 b?
TOI-530 b has a radius of 9.30 times that of Earth, or 0.83 times the radius of Jupiter. Its mass is 127 times that of Earth, giving it a density of 0.93 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-530 b in the Habitable Zone?
TOI-530 b orbits inside the inner edge of the habitable zone of TOI-530. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-530: 0.181–0.465 AU (conservative: 0.229–0.441 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-530 b
The equilibrium temperature of TOI-530 b is about 565 K (292 °C) — hotter than anywhere on Earth. 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-530 b — one full orbit around TOI-530 — lasts 6.39 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.052 AU — closer to its star than Mercury is to the Sun.
How Was TOI-530 b Discovered?
TOI-530 b was discovered in 2021 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-530 b?
TOI-530 b is 485.2 light-years (148.8 parsecs) from Earth. Light arriving here tonight left the planet around the year 1541. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 8,539,520 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-530 b scores 0.15, ranking #4,219 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-530
TOI-530
- Spectral type
- M0.5 V
- Surface temperature
- 3,659 K (Sun: 5,772 K)
- Mass
- 0.53 M☉
- Radius
- 0.54 R☉
- Luminosity
- 0.0490 L☉
Planetary System
TOI-530 b is the only planet known to orbit TOI-530 so far.
TOI-530 b — Complete Data
| Radius | 9.303 Earth radii (0.830 Jupiter radii) |
|---|---|
| Mass | 127.13 Earth masses (0.400 Jupiter masses) |
| Density | 0.93 g/cm³ (Earth: 5.51) |
| Orbital period | 6.39 days |
| Orbital distance | 0.052 AU |
| Equilibrium temperature | 565 K (292 °C) |
| Earth Similarity Index | 0.15 |
| Distance from Earth | 485.2 light-years (148.8 parsecs) |
| Constellation | Gemini |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2021-10-11. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-530 b
Is TOI-530 b habitable?
No — TOI-530 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-530 b?
TOI-530 b is about 485 light-years from Earth in the constellation Gemini. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 8,539,520 years to get there.
How big is TOI-530 b compared to Earth?
TOI-530 b has 9.30 times the radius of Earth and about 127 times its mass.
How long is a year on TOI-530 b?
One orbit around TOI-530 takes 6.4 Earth days — short enough that 57 of its years would fit into one Earth year.
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