Discovery[1] | |
---|---|
Discovered by | L. Delrez et al. |
Discovery date | 2015 |
Transit | |
Designations | |
Tylos[2] | |
Orbital characteristics[3] | |
0.02596+0.00043 −0.00063 AU | |
Eccentricity | <0.0032 |
1.27492504(15) d | |
Inclination | 88.49°±0.16° |
10°±10° | |
Star | WASP-121 |
Physical characteristics[3] | |
1.753±0.036 RJ | |
Mass | 1.157±0.070 MJ |
Mean density | 0.266+0.024 −0.022 g/cm3 |
9.33+0.71 −0.67 m/s2 (0.95 g) | |
Temperature | 2602±53 K (2,329 °C; 4,224 °F)[4] |
WASP-121b, formally named Tylos,[2] is an exoplanet orbiting the star WASP-121.[5][6] WASP-121b is the first exoplanet found to contain water in an extrasolar planetary stratosphere (i.e., an atmospheric layer in which temperatures increase as the altitude increases).[5][6] WASP-121b is in the constellation Puppis,[7] and is about 858 light-years from Earth.[8][5][9]
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