Electronic Telegram No. 5722
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)
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Prepared using the Tamkin Foundation Computer Network


COMET 220P/McNAUGHT
     This comet has gone into another major outburst, following that
reported on CBET 5698.  J. A. Henríquez Santana, reports that CCD
observations obtained with a 0.20-m reflector located at Santa Cruz de 
Tenerife, Canary Islands, Spain, on Aug. 5.12 UT yields total mag 9.4
and coma diameter 0'.2.  Further total-magnitude and coma-diameter 
estimates (visual unless noted otherwise):  June 12.10, 10.3, 5' (J. J. 
Gonzalez, Leon, Spain, 0.20-m reflector); 26.05, 11.8, 0'.6 (W. Hasubick, 
Buchloe, Germany, 44 cm-reflector); Aug. 5.78, 6.8, 7' (K. Yoshimoto, 
Yamaguchi, Japan, 8x42 binoculars); 6.04, 6.1, 9' (Gonzalez, Cueto Rosales, 
Leon, Spain, 10x50 binoculars); 6.37, 7.0, 5' (A. Amorim, 20x50 binoculars;
moonlight interference).  CCD total-magnitude and coma-diameter 
measurements from Y. Nagai (Saitama, Japan, 0.05-m refractor):  June 
15.75, 11.5, 1'.7; July 9.72, 13.0, 1'.0; 19.73, 13.5, 1'.6; 28.74, 
14.0, 0'.9.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2026 CBAT
2026 August 7                    (CBET 5722)              Daniel W. E. Green