the paper

Santana-Ros et al: "#Hayabusa2 extended mission target asteroid #1998KY26 is smaller and rotating faster than
previously known."

https://www.eso.org/public/archives/releases/sciencepapers/eso2515/eso2515a.pdf

Additional background information on dark comets:

#TeamRadar observed the dark comet #1998KY26 in 1998: https://echo.jpl.nasa.gov/asteroids/ostro+1999_ky26_science.pdf . It is a lumpy ball ~30 m across.

The #Hayabusa2 spacecraft is now on its way there, with arrival in 2031 July.

Addendum:

Seligman et al. 2023 discuss at length other things that can push small asteroids around: thermal fracturing throwing dust out, asymmetric meteoroid bombardment, etc.

Resolving this will probably have to wait for @[email protected]/@haya2e_jaxa
to get to #1998KY26.

Addendum:

Seligman et al. 2023 discuss at length other things that can push small asteroids around: thermal fracturing throwing dust out, asymmetric meteoroid bombardment, etc.

Resolving this will probably have to wait for @[email protected] / @[email protected] to get to #1998KY26.

@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?