 Artist's impression of SPECULOOS-3 b and its host star, a red dwarf much cooler, dimmer than smaller than the Sun. | |
| Discovery[1] | |
|---|---|
| Discovered by | Michael Gillon et al. |
| Discovery site | SPECULOOS |
| Discovery date | May 15, 2024 |
| Transit method[2] | |
| Designations | |
Named after | SPECULOOS |
| Orbital characteristics[1] | |
| 0.00733 AU | |
| 0.719 days (17 hours and 15 min.) | |
| Inclination | 89.44°±0.39° |
| Star | LSPM J2049+3336 (SPECULOOS-3) |
| Physical characteristics[1] | |
| 0.977±0.02 R🜨 0.07273 RJ | |
| Mass | 0.894 M🜨 (estimate)[3] |
| 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.[4] 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.[5] Its discovery was made using the SPECULOOS project, and announced in May 2024 in the academic journal Nature Astronomy.[6]
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.[1]
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