 illustration of TOI-2180 b | |
| Discovery | |
|---|---|
| Discovered by | The TESS-Keck Survey |
| Discovery date | February 2022 |
| Transit Method | |
| Designations | |
| HD 238894 b | |
| Orbital characteristics | |
| 0.828±0.012 au[1] | |
| Eccentricity | 0.3683 ± 0.0073[1] |
| 260.15764 ± 0.00045 days[2] | |
| Inclination | 89.955+0.032 −0.044[1] |
| Star | HD 238894 |
| Physical characteristics | |
| 1.010+0.022 −0.019 RJ | |
| Mass | 2.755+0.087 −0.081 MJ[1] |
| 3.827+0.012 −0.015 dex[1] | |
| Temperature | 348.0+3.3 −3.6 K[1] |
TOI-2180 b is a giant exoplanet orbiting the G-type star TOI-2180, also known as HD 238894.[1] It was discovered with the help of the Transiting Exoplanet Survey Satellite and is currently the exoplanet with the longest orbital period TESS was able to uncover (as of September 2022).[3] TOI-2180 b orbits its host star every 260.16 days.[2]
- ^ a b c d e f g Dalba, Paul A.; Kane, Stephen R.; Dragomir, Diana; Villanueva, Steven; Collins, Karen A.; Jacobs, Thomas Lee; LaCourse, Daryll M.; Gagliano, Robert; Kristiansen, Martti H.; Omohundro, Mark; Schwengeler, Hans M.; Terentev, Ivan A.; Vanderburg, Andrew; Fulton, Benjamin; Isaacson, Howard (2022-02-01). "The TESS-Keck Survey. VIII. Confirmation of a Transiting Giant Planet on an Eccentric 261 Day Orbit with the Automated Planet Finder Telescope". The Astronomical Journal. 163 (2): 61. arXiv:2201.04146. Bibcode:2022AJ....163...61D. doi:10.3847/1538-3881/ac415b. ISSN 0004-6256. S2CID 245877799.
- ^ a b Dalba, Paul A.; Jacobs, Thomas Lee; Omohundro, Mark; Gagliano, Robert; Jursich, Jay; Kristiansen, Martti H.; LaCourse, Daryll M.; Schwengeler, Hans M.; Terentev, Ivan A. (2022-04-01). "The Refined Transit Ephemeris of TOI-2180 b". Research Notes of the American Astronomical Society. 6 (4): 76. Bibcode:2022RNAAS...6...76D. doi:10.3847/2515-5172/ac64fd. ISSN 2515-5172. S2CID 248150224.
- ^ "Planetary Systems". exoplanetarchive.ipac.caltech.edu. Retrieved 2022-09-12.