TOI-5624 d
TOI-5624 d is a puffy low-density planet orbiting TOI-5624 in the constellation Ursa Major. It lies about 332 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-5624 d?
TOI-5624 d has a radius of 3.58 times that of Earth. Its mass is 4.9 times that of Earth, giving it a density of 0.59 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-5624 d in the Habitable Zone?
TOI-5624 d orbits inside the inner edge of the habitable zone of TOI-5624. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-5624: 0.537–1.283 AU (conservative: 0.680–1.216 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-5624 d
The equilibrium temperature of TOI-5624 d is about 713 K (439 °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-5624 d — one full orbit around TOI-5624 — lasts 13.7 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.107 AU — closer to its star than Mercury is to the Sun.
How Was TOI-5624 d Discovered?
TOI-5624 d 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-5624 d?
TOI-5624 d is 332.4 light-years (101.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1694. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 5,850,240 years to make the journey.
The Host Star: TOI-5624
TOI-5624
- Surface temperature
- 5,327 K (Sun: 5,772 K)
- Mass
- 0.86 M☉
- Radius
- 0.82 R☉
- Luminosity
- 0.4860 L☉
- Age
- 5.7 billion years (Sun: 4.6)
The TOI-5624 Planetary System
TOI-5624 d is one of 5 known planets in the TOI-5624 system. Its siblings:
- TOI-5624 b (Super Earth)
- TOI-5624 c (Mini Neptune)
- TOI-5624 e (Puffy Planet)
- TOI-5624 f (Neptune-like)
TOI-5624 d — Complete Data
| Radius | 3.584 Earth radii (0.320 Jupiter radii) |
|---|---|
| Mass | 4.90 Earth masses (0.015 Jupiter masses) |
| Density | 0.59 g/cm³ (Earth: 5.51) |
| Orbital period | 13.73 days |
| Orbital distance | 0.107 AU |
| Equilibrium temperature | 713 K (439 °C) |
| Distance from Earth | 332.4 light-years (101.9 parsecs) |
| Constellation | Ursa Major |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-05-07. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-5624 d
Is TOI-5624 d habitable?
No — TOI-5624 d orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-5624 d?
TOI-5624 d is about 332 light-years from Earth in the constellation Ursa Major. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 5,850,240 years to get there.
How big is TOI-5624 d compared to Earth?
TOI-5624 d has 3.58 times the radius of Earth and about 4.9 times its mass.
How long is a year on TOI-5624 d?
One orbit around TOI-5624 takes 13.7 Earth days — short enough that 27 of its years would fit into one Earth year.
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