Electronic Telegram No. 5076 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 ANDROMEDID METEOR SHOWER 2021 P. Jenniskens, SETI Institute and Ames Research Center, NASA; and N. Moskovitz, Lowell Observatory, add to a report of rising Andromedid meteor rates (IAU shower 18 from comet 3D/Biela) in the past week (cf. CBET 5072) by pointing out that rates peaked over Northern America on Nov. 28. That night, the CAMS video-based meteoroid orbit surveys in Arizona and California had clear weather and triangulated 122 Andromedids between 1h30m and 11h55m UTC (cf. http://cams.seti.org/FDL/ for the date of 2021 Nov. 28). The distribution of detections is centered on 05h18m +/- 10m UTC, corresponding to solar longitude 245.887 +/- 0.007 deg (equinox J2000.0) with a full-width- at-half-maximum of only 4.0 +/- 0.5 hours. The meteors radiated from a geocentric radiant in the constellation Andromeda at R.A. = 25.8 +/- 2.2 deg, Decl. = +44.7 +/- 1.3 degrees (equinox J2000.0) with geocentric velocity 16.7 +/- 3.1 km/s. Median orbital elements were a = 3.8 AU, q = 0.858 +/- 0.018 AU, e = 0.771 +/- 0.181, i = 13.6 +/- 1.9 deg, Peri. = 225.7 +/- 1.9 deg, and Node = 245.87 +/- 0.09 deg (equinox J2000.0). Most were faint meteors with a steep magnitude distribution index 3.8 +/- 0.3. Based on past outburst activity, the shower is expected to remain active until about Dec. 6. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2021 CBAT 2021 November 30 (CBET 5076) Daniel W. E. Green