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 @haya2_jaxa@twitter.com/@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 @haya2_jaxa@twitter.com / @haya2e_jaxa@twitter.com 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?

How could a ~30 m near-Earth asteroid like #1998KY26 hold on to volatiles long enough to still be outgassing?

Hmm...

Today on the arXiv:

Seligman et al. 2023, "Dark Comets? Unexpectedly Large Nongravitational Accelerations on a Sample of Small Asteroids" - https://arxiv.org/pdf/2212.08115.pdf

Suggests outgassing from asteroid #1998KY26, to be visited by Hayabusa 2, at a level #TeamRadar could not detect.

Discussion of the #Hayabusa2 spacecraft's extended mission to asteroid #1998KY26.

RT @haya2_jaxa@twitter.com

【はやつーさんもじ】
No.0: ♯ (SHARP) – Small Hazardous Asteroid Reconnaissance Probe
はやぶさ2拡張ミッションの♯はSmall Hazardous Asteroid Reconnaissance Probeの頭文字で、「地球に衝突する可能性のある、小さいけれど危険な小惑星を偵察する探査機」を意味します。
(IES弟子)
#haya2AtoZ

🐦🔗: https://twitter.com/haya2_jaxa/status/1600064532889874432