HD 149026 b [SEP] constellation
HD 149026 b
HD 149026 b, formally named Smertrios , is an extrasolar planet approximately 250 light-years from the Sun in the constellation of Hercules.
The 2.8766-day period planet orbits the yellow subgiant star HD 149026 at a distance of 0.042 AU 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.
Name.
Following its discovery in 2005 the planet was designated HD 149026 b. In July 2014 the
uncertainty in the stellar radius", and measurement of the stellar radius is distorted by pollution on the star's surface.
Even allowing for uncertainty the radius of HD 149026 b is only about three quarters that of Jupiter (or 83% that of Saturn). HD 149026 b was the first of its kind: HD 149026 b's low volume means that the planet is too dense for a Saturn-like gas giant of its mass and temperature.
It may have an exceptionally large core composed of elements heavier than