Astronomy:TOI-5624 b
| File:The diagram compares Mercury's orbit with the TOI-5624 planets.jpg Artistic depiction of the TOI-5624 system (sizes to scale) compared to Mercury's orbit. TOI-5624 b is the innermost planet with in the system, designated as 5624 b. | |
| Discovery | |
|---|---|
| Discovered by | Andrea Bonfant et al. |
| Discovery site | Transiting Exoplanet Survey Satellite |
| Discovery date | April 22, 2026 |
| Transit | |
| Orbital characteristics | |
| 0.04201+0.00041 −0.00043 astronomical unit|AU | |
| Eccentricity | 0 (fixed) |
| Orbital period | 3.3903473±0.0000054 d |
| Inclination | 89.41+0.41 −0.51 |
| 90 (fixed) | |
| Semi-amplitude | 4.46±0.65 m/s |
| Star | TOI-5624 |
| Physical characteristics | |
| Mean radius | 2.314±0.035 R🜨 |
| Mass | 9.4±1.4 M🜨 |
| Mean density | 4.00+0.60 −0.59 g/cm3 |
| Physics | 1,136 ± 15 K (862.9 ± 15.0 °C; 1,585.1 ± 27.0 °F) |
TOI-5624 b is the innermost and smallest exoplanet discovered in the TOI-5624 system, located approximately 331 light-years from Earth in the constellation Ursa Major. The planet was confirmed in late April 2026 using the transit method.[1][2]
Characteristics
Physical characteristics
| Neptune | TOI-5624 b |
|---|---|
|
|
The object is classified as a dense hot sub-Neptune, with a mass of 9.4±1.4 M🜨 and a radius of 2.314±0.035 R🜨.[1][2] These parameters were determined using the radial velocity method and the European CHEOPS telescope. Its average density, equal to 4.00+0.60
−0.59 g/cm3, indicates the presence of a significant solid core surrounded by a less massive gaseous envelope.[1][2]
Orbit
The planet is the closest to its host star, and therefore its orbital period is 3.3903473±0.0000054 Earth days, at a distance of 0.04201+0.00041
−0.00043 astronomical unit|AU.[1][2] Due to its proximity to the star, the equilibrium temperature reaches 1136 K or 863 °C.[1][2]
See also
- List of exoplanets discovered in 2026
- Methods of detecting exoplanets
References
- ↑ 1.0 1.1 1.2 1.3 1.4 "The multi-planet system TOI-5624: Four transiting sub-Neptunes with an outer companion revealed by transit-timing variations". 2026-04-21. arXiv:2604.15035 [astro-ph.EP].
- ↑ 2.0 2.1 2.2 2.3 2.4 Cowing, Keith (2026-04-19). "The Multi-planet System TOI-5624: Four Transiting Sub-Neptunes With An Outer Companion Revealed By Transit-timing Variations" (in en-US). https://astrobiology.com/2026/04/the-multi-planet-system-toi-5624-four-transiting-sub-neptunes-with-an-outer-companion-revealed-by-transit-timing-variations.html.
External links
- Martin, Pierre-Yves (2026). "Planet TOI-5624 b" (in en). https://exoplanet.eu/catalog/toi_5624_b--12041/.
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