Electronic Telegram No. 5155
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


COMET 285P/LINEAR
     This comet, at its third observed apparition, seems to have undergone an
outburst prior to Aug. 1.35 UT, when it was reported at astrometric magnitude
16.0 from CCD images taken with a 0.5-m f/2 Schmidt reflector at Mauna Loa,
Hawaii, in the course of the "Asteroid Terrestrial-Impact Last Alert System"
(ATLAS) search program, after it had been reported at total mag 20.6 on July
28.63 and 29.56 by T. Oribe with a 1.03-m reflector at Saji, Japan (cf. MPEC
2022-P82).
     CCD total magnitudes and coma diameters reported to the Central Bureau:
Aug. 6.86 UT, 15.3, 10" (A. Aletti and L. Buzzi, remotely using a 0.36-m
reflector at Hakos, Namibia; twenty-three stacked 30-s exposures show a
condensed coma with a broad tail at least 12" long centered at p.a. 135
degrees; magnitude in aperture of size 5"); Aug. 7.13, 14.8, 0'.35 (K.
Yoshimoto, Yamaguchi, Japan, 0.43-m reflector; very condensed coma and broad
tail 0'.3 long in p.a. 140 deg; coma color index V-I = +0.83); Aug. 7.20,
15.1, 0'.5 (C. S. Morris, Fillmore, CA, USA, 0.41-m reflector); Aug. 7.50,
14.9, about 0'.8 (Hirohisa Sato, Sukagawa, Japan, 0.25-m reflector; strongly
condensed coma about 0'.8 in diameter with a short tail about 0'.7 long
toward p.a. about 142 degrees in fifteen stacked 60-s exposures); Aug. 7.54,
14.7, 0'.7 (K. Kadota, Ageo, Japan, 0.25-m reflector; strong central
condensation, with a hint of a short tail towards the  southeast).
     The ICQ-predicted magnitude now is around 18.5-19 (see ephemeris by
S. Nakano at website URL https://www.oaa.gr.jp/~oaacs/obscmt/E274.htm),
with the comet at r = 1.3 AU and five months prior to perihelion (at q =
1.72 AU).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2022 CBAT
2022 August 8                    (CBET 5155)              Daniel W. E. Green