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Feasibility study of a mission to Sedna – Nuclear propulsion and solar sailing

(arxiv.org)
200 points speckx | 1 comments | 01 Jul 25 14:08 UTC | HN request time: 0.261s | source
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chuckledog ◴[01 Jul 25 14:54 UTC] No.44434499[source]▶
https://en.m.wikipedia.org/wiki/Sedna_(dwarf_planet)
replies(1): >>44434770 #
imglorp ◴[01 Jul 25 15:18 UTC] No.44434770[source]▶
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...

replies(2): >>44434994 #>>44441200 #
1. unwind ◴[02 Jul 25 08:00 UTC] No.44441200[source]▶
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.