HD 149026 b
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.
Size comparison of HD 149026 b with Neptune and Jupiter. | |
| Discovery | |
|---|---|
| Discovered by | B. Sato, D. Fischer, G. Henry et al. |
| 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 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) |
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.
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