 Later , between 2009 and 2011 , another team of astronomers observed WASP @-@ 13b and WASP @-@ <unk> to find what caused some Hot Jupiters to have <unk> high radii . The <unk> photometric camera on the Liverpool Telescope was used to detect further transits . Two partial transits and two full transits were observed during this period , although the quality of both full transits was slightly compromised because of passing cloud cover . The collected observations , along with the JGT observations that were used to confirm the planet , were scaled to filter out errors such as background noise . The data was then used to re @-@ define WASP @-@ 13b 's parameters , including its age , mass , radius , and density . The study also noted that a limb darkening effect was present , a characteristic that may affect future atmospheric studies of the planet . 
