
#1
May1207, 12:14 AM

P: 15,325

I'm trying to find a reasonable estimate of the density of Gliese 581 d (not c).
According to Wiki, d is ~1.96x the radius of Earth and ~7.7x the mass. This makes for a density very near Earth's (2^3=8). Yet they then go on to list its density as 730kg/m^3 or 0.73g/cm^3  almost as rarefied as Saturn. Can anyone point me at some more authoritative numbers? I know we're only estimating, but clearly one of those three numbers r,d or m is spurious. 



#2
May1207, 11:51 PM

P: 499

I notice the article you mention is lacking citations on both the radius and the density, so it is possible those are flawed as well. 


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