bstabens t1_iwtfxvf wrote
Reply to comment by UmbralRaptor in Is it possible for two planets to orbit each other in a way where Planet A is tidally locked to the sun while Planet B is in geostationary orbit on the dark side of Planet A, thus putting Planet B in a constant total solar eclipse? by FenrirButAGoodBoy
In a scenario where planet B is perpetually in planet A's shadow, wouldn't that mean both planets are in a tidally locked orbit around the sun and not the one around the other?
As in, yes, that scenario is possible, but not with the requirements you want?
Lyrle t1_iwuprni wrote
No, not possible. Orbital speed is a function of distance between the two bodies, with closer orbits having faster speeds. This compounds with closer orbits also being shorter paths. The lit planet would be going around its star faster than the eclipsed planet, which would then un-eclipse it.
[deleted] t1_iwth262 wrote
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bstabens t1_iwtmeig wrote
Ehm, no, and you are right - having the same side to the sun always doesn't amount to nothing.
No, I was thinking more like two planets, close orbits, the outer slightly faster so it never really leaves the shadow of the inner. But I guess it is physically not possible to have a (two?) stable orbits of two big masses so close together that you'd see the shadow? I mean, even with the moon earth's shadow is so blurred the moon never gets black, just red.
HomeAl0ne t1_iwtoy4h wrote
The one further out would actually orbit slightly slower and fall behind.
bstabens t1_iwtta6e wrote
As in that's a physical law? Or just we don't have examples to the contrary?
Cmagik t1_iwtucqy wrote
Physical law The further away you are the slower you rotate around the object.
bstabens t1_iwtucz2 wrote
Scratch that, just thought about it. Of course the dust disk where the planets come from would be slower on the outskirts and fastest at the center.
brasticstack t1_iww4uvn wrote
More like those funnel things that you can send coins down when you're at the museum.
[deleted] t1_iwun35i wrote
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Ok-disaster2022 t1_iwv4iuy wrote
Arguably couldnt B be considered a stalleote of A that has an orbital period of once a year?
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