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If it's artificial we should consider a staggering variety of possibilities including ice rockets. But I've thought of a natural explanation: a comet-like object that experienced a natural high-energy event of duration less than its rotation time, giving it an asymmetric albedo.https://twitter.com/mccrmx/status/1065445820059738112 …
We happen to live in a solar system where objects have not experienced such an event, but perhaps among interstellar objects, being hit by ancient high-energy radiating events (there are many kinds) is common in their geological history.
The causation could be indirect: chemical changes caused by the high-energy event might make one side of the object more immune to dust being blown off or ice deposited than the other side, so when we observed it one side or part was exposed ice and other(s) dark soot.
From original paper: "A roughly spherical object with a hemispheric albedo variation of a factor of 10 could also reproduce the lightcurve [instead of 10:1 oblong shape]" Per above theory ‘Oumuamua has an unusual albedo variation not an unusual shape. https://www.eso.org/public/archives/releases/sciencepapers/eso1737/eso1737a.pdf …
That high energy event would likely have created its rotation time
Certainly would have altered it.
Given my understanding that we are only observing a very small portion of the sky, but that we’ve made very many observations (although I don’t know how many at the resolution needed to observe this) and that the distribution of these types of objects is normal in the universe
I would bet that this type of object is pretty rare in the universe. But not so rare that a civilization capable of observing one wouldn’t see one every x number of observations. So my conclusion is What other crazy phenomenon like this have we yet to observe?
Great, I'm going to waste all next week reading and thinking about ice rockets now that I saw this
My doctor gave me medication for my low albedo. Never heard of asymmetric albedo though
In deed, the event duration being the same as rotation time would have been much stranger.
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