Electronic Telegram No. 2495
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; 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 103P/HARTLEY
     J. Crovisier, P. Colom, N. Biver, and D. Bockelee-Morvan, LESIA,
Observatoire de Paris, report that observations of the 18-cm lines of OH
in comet 103P/Hartley with the Nancay radio telescope show an increase in
the average OH-production rate from (0.8 +/- 0.1) x 10**28 molecules/s
during Sept. 30-Oct. 4 to (1.2 +/- 0.1) x 10**28 molecules/s during
Oct. 9-12.

     Visual total-magnitude and coma-diameter estimates:  Sept. 28.83 UT, 7.2,
18' (J. J. Gonzalez, Leon, Spain, 10x50 binoculars); 29.82, 7.3, 12' (B. H.
Granslo, Orfiske, Nittedal, Norway, 7x50 binoculars); 30.80, 7.3, 25' (T.
Scarmato, Calabria, Italy, 7x50 binoculars); Oct. 1.90, 7.5, 15' (J. Warell,
Fiby Observatory, Uppsala, Sweden, 7x50 binoculars); 2.87, 6.8, 35' (Scarmato);
4.83, 5.3, 45' (Gonzalez, naked eye); 5.67, 5.9, 32' (K. Yoshimoto, Yamaguchi,
Japan, 7x35 binoculars); 6.83, 6.7, 18' (G. Pappa, Mascalucia, Italy, 12x50
binoculars); 7.87, 5.8, 35' (Scarmato); 8.32, 5.8, about 30' (C. S. Morris,
Fillmore, CA, U.S.A., 10x50 binoculars); 8.84, 6.3, 12' (A. Diepvens, Balen,
Belgium, 20x50 binoculars); 9.95, 5.7, 30' (K. Hornoch, Ondrejov, Czech Rep.,
naked eye); 10.80, 5.9, about 25' (Granslo); 11.34, 5.8, 30' (Morris).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2010 CBAT
2010 October 13                  (CBET 2495)              Daniel W. E. Green