@astrokiwi For the NEAs in this sample; there are options on thermal fracturing, asymmetric meteoroid bombardment, etc. that would push the rock piles around a little bit without outgassing - Seligman et al. rightly discussed the possibilities at length (comparing to Bennu).

Some may not work - e.g. #1998KY26 spins fast, so thermal swings are low.

But that seems qualitatively different than #ʻOumuamua?

This is really good to see people looking into as it was a key issue with #ʻOumuamua. The level of understanding around low-emission-outgassing minor planets needs to step up a level #astrodon

#TBT to some of the best views of #ʻOumuamua captured from our telescopes. Anything more detailed than this is hypothetical or an artist rendition 😉

This is fig. 1 from @astrokiwi
et al "The Natural History of ‘Oumuamua"

https://arxiv.org/abs/1907.01910