 Artist's impression and size comparison with Earth and Mars | |
| Discovery[1] | |
|---|---|
| Discovery date | March 2019 |
| Transit | |
| Orbital characteristics[2] | |
| 0.02191+0.00080 −0.00084 AU | |
| Eccentricity | 0.103+0.117 −0.045 |
| 2.2531136+0.0000012 −0.0000015 d | |
| Inclination | 87.71°+1.16° −0.44° |
| Semi-amplitude | 0.56±0.16 m/s[3] |
| Star | L 98-59 |
| Physical characteristics[2] | |
| 0.850+0.061 −0.047 R🜨 | |
| Mass | 0.47+0.13 −0.15 M🜨[3] |
Mean density | 4.3+1.2 −1.9 g/cm3[3] |
| Temperature | 627+33 −36 K (354 °C; 669 °F, equilibrium) |
L 98-59 b is an exoplanet having a size between that of the Earth and Mars and a mass only half that of Venus.[2] It orbits L 98-59, a red dwarf star 34.6 light-years away in the constellation Volans. There are at least 3 (possibly 4) other planets in the system: L 98-59 c, d, e, and the unconfirmed L 98-59 f.[2] Its discovery was announced on 27 June 2019 in The Astronomical Journal[1] and in a NASA press release. It was the smallest planet discovered by TESS[4] until the discovery of LHS 1678 b,[5] and was the lowest-mass planet whose mass had been measured using radial velocities[2] until Proxima Centauri d was found in 2022.[6]
- ^ a b Cite error: The named reference
Kostov2019was invoked but never defined (see the help page). - ^ a b c d e Cite error: The named reference
Demangeon2021was invoked but never defined (see the help page). - ^ a b c Cite error: The named reference
Rajpaul2024was invoked but never defined (see the help page). - ^ Garner, Rob (2019-06-24). "NASA's TESS Mission Finds Its Smallest Planet Yet". NASA. Retrieved 2019-06-29.
- ^ Silverstein, Michele L.; Schlieder, Joshua E.; Barclay, Thomas; Hord, Benjamin J.; Jao, Wei-Chun; Vrijmoet, Eliot Halley; Henry, Todd J.; Cloutier, Ryan; Kostov, Veselin B.; Kruse, Ethan; Winters, Jennifer G.; Irwin, Jonathan M.; Kane, Stephen R.; Stassun, Keivan G.; Huang, Chelsea (2022-04-01). "The LHS 1678 System: Two Earth-Sized Transiting Planets and an Astrometric Companion Orbiting an M Dwarf Near the Convective Boundary at 20 pc". The Astronomical Journal. 163 (4): 151. arXiv:2110.12079. Bibcode:2022AJ....163..151S. doi:10.3847/1538-3881/ac32e3. ISSN 0004-6256. S2CID 239768873.
- ^ Faria, J. P.; Suárez Mascareño, A.; et al. (January 4, 2022). "A candidate short-period sub-Earth orbiting Proxima Centauri" (PDF). Astronomy & Astrophysics. 658. European Southern Observatory: 17. arXiv:2202.05188. Bibcode:2022A&A...658A.115F. doi:10.1051/0004-6361/202142337.