PSR J2322−2650 b
Artist's impression of the pulsar planet PSR J2322-2650b. | |
| Discovery | |
|---|---|
| Discovered by | Spiewak et al. |
| Discovery site | Cheshire, England |
| Discovery date | 2017 |
| Pulsar timing | |
| Orbital characteristics | |
| 0.0102 AU (1,530,000 km) | |
| Eccentricity | < 0.0017 |
| 0.322964 d 7.7511 h | |
| Star | PSR J2322−2650 |
| Physical characteristics | |
| Mass | ~0.7949 MJ (~252.64 M🜨) |
Mean density | >1.84 g cm3 |
| Temperature | 1,200 °F (649 °C, nightside) 3,700 °F (2,038 °C, dayside) |
PSR J2322−2650 b is a tidally locked exoplanet discovered in 2017, orbiting the millisecond pulsar PSR J2322−2650. In 2025, the James Webb Space Telescope found that the planet's atmosphere is dominated by helium and carbon, likely featuring clouds of carbon soot that condense to create diamonds, but an unexplained absence of nitrogen and oxygen. PSR J2322−2650 b orbits approximately 1 million miles from its host star—a distance equivalent to less than 1% of earth's orbit. The gravitational pull from the host star is so intense that the planet has been stretched into the shape of a lemon.