{"paper":{"title":"On the Anomalous Acceleration of 1I/2017 U1 `Oumuamua","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Darryl Seligman, Gregory Laughlin, Konstantin Batygin","submitted_at":"2019-03-12T04:25:47Z","abstract_excerpt":"We show that the $P\\sim8\\,{\\rm h}$ photometric period and the astrometrically measured $A_{\\rm ng}\\sim2.5\\times10^{-4}\\,{\\rm cm\\,s^{-2}}$ non-gravitational acceleration (at $r\\sim1.4\\,{\\rm AU}$) of the interstellar object 1I/2017 (`Oumuamua) can be explained by a nozzle-like venting of volatiles whose activity migrated to track the sub-solar location on the object's surface. Adopting the assumption that `Oumuamua was an elongated $a\\times b \\times c$ ellipsoid, this model produces a pendulum-like rotation of the body and implies a long semi-axis $a\\sim 5A_{\\rm ng}P^2/4\\pi^2 \\sim 260\\,{\\rm m}$."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1903.04723","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}