HD 149026 b
Extrasolar planet in the constellation Hercules / From Wikipedia, the free encyclopedia
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HD 149026 b, formally named Smertrios /ˈsmɜːrtriɒs/, is an extrasolar planet and hot Jupiter approximately 250 light-years from the Sun in the constellation of Hercules.
Quick Facts Discovery, Discovered by ...
Discovery | |
---|---|
Discovered by | B. Sato, D. Fischer, G. Henry et al.[1] |
Discovery site | W. M. Keck Observatory |
Discovery date | 1 July 2005 |
Radial velocity | |
Orbital characteristics | |
0.042 AU (6.3 Gm) | |
Eccentricity | 0 |
2.87588874 ± 5.9×10−7[2] d | |
Semi-amplitude | 43.2 ± 2.6 |
Star | HD 149026 |
Physical characteristics | |
Mean radius | 0.725 ± 0.03 RJ |
Mass | 0.36 ± 0.03 MJ |
Mean density | 1,252 kg/m3 (2,110 lb/cu yd) |
Temperature | 2,300 K (2,030 °C; 3,680 °F) |
Close
The 2.8766-day period planet orbits the yellow subgiant star HD 149026 at a distance of 0.042 AU (3.9 million mi; 6.3 million km) and is notable first as a transiting planet, and second for a small measured radius (relative to mass and incoming heat) that suggests an exceptionally large planetary core.