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Its eccentricity distribution evolves mostly due to the Yarkovsky/YORP effect and assuming that: (i) impact disruption was isotropic, and (ii) albedo distribution of small asteroids is the same as for large ones, we can estimate the age of the Hilda family to be $4_{-1}^{+0}\\,{\\rm Gyr}$. We also calculate collisional activity in the J3/2 region. Our results indicate that current collisional rates are very low for a 200\\,km parent body such that the number of expected events o"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1109.1114","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2011-09-06T08:44:53Z","cross_cats_sorted":[],"title_canon_sha256":"8c7dfe2c0614e1fb2b993061d23b08b1fc0c4a0ce19309798fa23d3e0451ac67","abstract_canon_sha256":"f301db970bd79585a0407d3e60f3b63373b69d75c0bc9de7e030d35ef22492dc"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:14:05.365417Z","signature_b64":"kEeeyFPfeptLyxu7Q4/wQ/OxqeG961Hw5HQOfiEHYzeKApRQJTVNaQKxZI0MOfKQnGmddIzgseGkm+AVohv/Bw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"aab4278fe4c44b338481a793fbb48d7a8e43c6d657996d54c187ae0bb6cde851","last_reissued_at":"2026-05-18T04:14:05.364944Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:14:05.364944Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Did the Hilda collisional family form during the late heavy bombardment?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"A. 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