TOI-2257 b

TOI-2257 b
Discovery[1]
Discovered bySchanche et al.
Discovery dateNovember 2021
Transit
Orbital characteristics[1]
0.145±0.003 AU
Eccentricity0.496+0.216
−0.133
35.189346(90) d
Inclination89.786°+0.078°
−0.062°
StarTOI-2257
Physical characteristics[1]
2.194+0.113
−0.111 R🜨
Mass5.712+4.288
−2.311 M🜨 (predicted)
Temperature256+61
−17 K (−17 °C; 1 °F, equilibrium)

TOI-2257 b is an extremely eccentric (0.496)[2] exoplanet in or near the circumstellar habitable zone of the star TOI-2257, 188 light-years away. It is likely a sub-Neptune exoplanet, with a mass of 5.71 Mearth and a radius of 2.19 Rearth.[3] As a small planet in the habitable zone, it is included in the Planetary Habitability Laboratory's list of potentially habitable exoplanets.[4]

  1. ^ a b c Cite error: The named reference Schanche2022 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference :2 was invoked but never defined (see the help page).
  3. ^ Nowakowski, Tomasz; Phys.org. "Astronomers discover a sub-Neptune exoplanet orbiting nearby star". phys.org. Retrieved November 17, 2023.
  4. ^ "PHL @ UPR Arecibo - The Habitable Exoplanets Catalog". phl.upr.edu. Retrieved November 17, 2023.