top | item 44434499 (no title) chuckledog | 8 months ago https://en.m.wikipedia.org/wiki/Sedna_(dwarf_planet) discuss order hn newest imglorp|8 months ago They know its radius is ~1000km but interestingly, there is no way to determine its mass without a flyby or other gravitational interaction. I guess you could swag it by using the lunar density, which gives ~~~ 10^22 kg.https://www.wolframalpha.com/input?i=4.189%C3%9710%5E9+km%5E... _joel|8 months ago Wouldn't it's composition be of more ice and rock (like pluto), therefore lower density than the moon? load replies (1) unwind|8 months ago It's actually the diameter that is 1,000 km, so I guess that changes the mass if assuming Lunar density to around 1.74×10^21 kg.
imglorp|8 months ago They know its radius is ~1000km but interestingly, there is no way to determine its mass without a flyby or other gravitational interaction. I guess you could swag it by using the lunar density, which gives ~~~ 10^22 kg.https://www.wolframalpha.com/input?i=4.189%C3%9710%5E9+km%5E... _joel|8 months ago Wouldn't it's composition be of more ice and rock (like pluto), therefore lower density than the moon? load replies (1) unwind|8 months ago It's actually the diameter that is 1,000 km, so I guess that changes the mass if assuming Lunar density to around 1.74×10^21 kg.
_joel|8 months ago Wouldn't it's composition be of more ice and rock (like pluto), therefore lower density than the moon? load replies (1)
unwind|8 months ago It's actually the diameter that is 1,000 km, so I guess that changes the mass if assuming Lunar density to around 1.74×10^21 kg.
imglorp|8 months ago
https://www.wolframalpha.com/input?i=4.189%C3%9710%5E9+km%5E...
_joel|8 months ago
unwind|8 months ago