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A comment on Oumuamua may be a hydrogen iceberg. Parent comment

Re:Oumuamua may be a hydrogen iceberg by DarmokJalad1701 on Wednesday June 03, 2020 @07:05PM (#23410069)
> slingshot around the sun

You can only slingshot around the sun if you were already in a hyperbolic orbit w.r.t the sun. An object in a closed helio centric orbit cannot gain any momentum by "slingshotting" around the sun.

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Re:Oumuamua may be a hydrogen iceberg by monadic2 on Thursday June 04, 2020 @03:31AM (#23413708)
It can if it loses mass, correct? Energy conservation would result in increased momentum.
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Re:Oumuamua may be a hydrogen iceberg by fennecfoxen on Thursday June 04, 2020 @08:29AM (#23415703)
Yes. Your mass in low Sol orbit has a much higher specific orbital energy, so thrusting a rocket or ejecting mass while at or near perihelion makes more of a difference than doing so in deep space.
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