SPECULOOS-3 b
Artist's impression of SPECULOOS-3 b and its host star, a red dwarf much cooler, dimmer than smaller than the Sun. | |
| Discovery | |
|---|---|
| Discovered by | Michael Gillon et al. |
| Discovery site | SPECULOOS |
| Discovery date | May 15, 2024 |
| Transit method | |
| Designations | |
Named after | SPECULOOS |
| Orbital characteristics | |
| 0.00733 AU | |
| 0.719 days (17 hours and 15 min.) | |
| Inclination | 89.44°±0.39° |
| Star | LSPM J2049+3336 (SPECULOOS-3) |
| Physical characteristics | |
| 0.977±0.02 R🜨 0.07273 RJ | |
| Mass | 0.894 M🜨 (estimate) |
| Temperature | 553±8 K (280±8 °C) |
SPECULOOS-3 b is an Earth-sized exoplanet, orbiting the ultracool red dwarf star SPECULOOS-3. It is relatively close to Earth, at a distance of 55 light-years. SPECULOOS-3 b takes only about 17 hours to complete an orbit around SPECULOOS-3, and, because of that proximity, it receives very high levels of radiation and is tidally locked, meaning that one side of the planet always faces its host star. Its discovery was made using the SPECULOOS project, and announced in May 2024 in the academic journal Nature Astronomy.
The host star of SPECULOOS-3 b is SPECULOOS-3 (LSPM J2049+3336, TIC 230741378), an ultra-cool red dwarf star in the constellation Cygnus, with just one tenth of the Sun's mass, 13% of the size and 0.09% of its luminosity.