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Asteroid Strengths From ZTF and the Solar system Notification Alert Processing Pipeline (SNAPS)

Presentation #503.02 in the session Asteroids: Main Belt (Oral Presentation)

Published onOct 23, 2023
Asteroid Strengths From ZTF and the Solar system Notification Alert Processing Pipeline (SNAPS)

The Solar System Notification Alert Processing System (SNAPS) [1] is a data processing pipeline and database that ingests asteroid observations from the Zwicky Transient Facility (ZTF). SNAPShot1 [1] presents measured and derived properties (lightcurve amplitude, rotation period, color, absolute magnitude, etc.) for ~30,000 asteroids. Using these properties, we have modeled the minimum strength required to withstand rotational fission for all SNAPS asteroids. We find that 456 asteroids require non-zero minimum strength, which represents the largest set of such values calculated to date. These 456 objects do not all fall under the canonical 2.2 hour spin barrier typically assigned to Super Fast Rotators. In fact, many of the 456 objects have rotational periods greater than 2.2 hours. These results show that the conversation should be shifted from a two-dimensional spin barrier to a three-dimensional strength boundary surface in the space defined by size, elongation, and period. Additionally, we find that the strength distributions for big asteroids and small asteroids differ, though the distributions for C/S and inner/outer belt are indistinguishable. We hypothesize that this divergence across size regimes is caused by the underlying size-strength correlation. Overall, larger objects tend to require higher additional strength than smaller objects. The smaller objects in the large object distribution end up not being able to withstand rotational fission and either shell off material or experience disruption to their strength. This results in a reduction in size, and they migrate into the small object distribution, or lose strength and are no longer a part of the populations we are studying. At DPS we will present all of these results and a discussion of future directions of investigation. This work is supported in part by the Arizona Board of Regents and NSF grant 2206796.

Citations:

[1] Trilling, D. E. et al. (2023) AJ, 165, 111.

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