SETI public: Planet near H209458 with anomalous low density

[Rashid Faizullin <rtf@univer.omsk.su>]

Hello
Please see:

planet near H209458 -
Basic data:
          M:      0.69 ± 0.05 MJ
          Radius:
               1.54 ± 0.18 RJ (Mazeh et al. 2000)
               1.42 ± 0.08 RJ (Henry et al., 1999)
          Semi-major axis:      ~ 0.045 AU
http://www.obspm.fr/encycl/HD209458.html

Note  there are no hydrogen of course but density of the planet
is equal to 1/5 Jupiters density !
May be it hollow ?
WBR
R.Faizullin