Electronic Telegram No. 5465 Central Bureau for Astronomical Telegrams Mailing address: Hoffman Lab 209; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A. e-mail: cbatiau@eps.harvard.edu (alternate cbat@iau.org) URL http://www.cbat.eps.harvard.edu/index.html Prepared using the Tamkin Foundation Computer Network 2024 UQ P. Veres, Minor Planet Center, reports on MPEC 2024-U49 that a 17th-mag near-earth object discovered on Oct. 22.38 UT on CCD images taken with a 0.5-m f/2 Schmidt reflector at Haleakala, Hawaii, in the course of the "Asteroid Terrestrial-Impact Last Alert System" (ATLAS) search program (reported by H. Weiland) has apparently impacted the earth's atmosphere. Veres writes: "Shortly after its posting on [the MPC's NEOCP webpage], automated monitoring systems [SCOUT at the Jet Propulsion Laboratory and Meerkat at the European Space Agency (ESA)] identified a high probability of impact with Earth. The predicted impact time was several hours before the [object and astrometry were] submitted to [the] MPC. M. Micheli (ESA) later identified a potential flash in the GOES (GLM) satellite imagery, corresponding to the approximate time and location of the expected impact." Micheli subsequently found pre- discovery observations in Catalina Sky Survey CCD images obtained on Oct. 22.3 by V. F. Carvajal with the 0.68-m Schmidt telescope. U.S. Government satellite sensors detected a fireball on 2024 Oct. 22.4547 UT at 38.2 km located over the Pacific Ocean nearly halfway from San Francisco to Hawaii (cf. website URL https://cneos.jpl.nasa.gov/fireballs). The published low-inclination pre-impact orbit had q = 0.59 AU and e = 0.73. This would be the tenth known natural object to impact the earth's atmosphere after discovery by ground-based telescopes (cf. CBET 5438). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2024 CBAT 2024 October 23 (CBET 5465) Daniel W. E. Green