TOI-5624 d
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 Artistic depiction of the TOI-5624 system (sizes to scale) compared to Mercury's orbit. TOI-5624 d is the third and largest planet in the system, designated as 5624 d. | |
| Discovery | |
|---|---|
| Discovered by | Andrea Bonfant et al. |
| Discovery site | Transiting Exoplanet Survey Satellite |
| Discovery date | April 22, 2026 |
| Transit | |
| Orbital characteristics | |
| 0.1067+0.0010 −0.0011 AU | |
| Eccentricity | 0 (fixed) |
| 13.731468+0.000042 −0.000041 d | |
| Inclination | 89.69+0.20 −0.18 |
| 90 (fixed) | |
| Semi-amplitude | 1.45±0.65 m/s |
| Star | TOI-5624 |
| Physical characteristics | |
| 3.584+0.051 −0.050 R🜨 | |
| Mass | 4.9±2.2 M🜨 |
Mean density | 0.59+0.27 −0.26 g/cm3 |
| Temperature | 712.6+9.5 −9.4 K (439.45 °C; 823.01 °F) |
TOI-5624 d is the third and largest discovered exoplanet orbiting the star TOI-5624, with a size approximately three and a half times the diameter of Earth. The planet was confirmed in late April 2026 using the transit method.[1][2]
Physical characteristics
| Neptune | TOI-5624 d |
|---|---|
 |
 |
This planet is a puffy sub-Neptune. Its mass equals 4.9±2.2 M🜨, and its radius is 3.584+0.051
−0.050 R🜨.[1][2] This makes it the largest in radius among the four transiting bodies in the system. The average density is extremely low, about 0.59+0.27
−0.26 g/cm3, which is comparable to the density of Saturn.[1][2] This suggests the presence of an extended and massive atmosphere, constituting a significant part of the planet's volume. Consequently, the planet has a high transmission signal, making it a priority target for atmospheric studies using the James Webb Space Telescope.[1][2]
Orbit
The planet's orbital period is 13.731468+0.000042
−0.000041 Earth days at an average distance from its parent star of 0.1067+0.0010
−0.0011 AU . The equilibrium temperature is estimated at 712.6 K, or 439.45 °C.[1][2]
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