Circular No. 6752

Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION

Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.

IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)

     URL http://cfa-www.harvard.edu/iau/cbat.html

Phone 617-495-7244/7440/7444 (for emergency use only)

COMET 1997 T1

Additional precise observations:

1997 UT α_{2000} δ_{2000} m_{1} Observer
Oct. 5.78309 22^{h}34^{m}04.^{s}55 +71^{o}48′35′′.3  Tichá
5.78400 22 34 03.32 +71 48 33.4  _{”}
5.78484 22 34 02.17 +71 48 31.5  _{”}
5.98597 22 29 28.49 +71 40 48.8  Galád
5.99381 22 29 17.98 +71 40 30.1  _{”}
5.99954 22 29 10.29 +71 40 16.4 11.3  _{”}
6.04894 22 28 03.75 +71 38 17.7  Pravec
6.05128 22 28 00.58 +71 38 11.9  _{”}
6.05365 22 27 57.45 +71 38 06.2  _{”}
6.05544 22 27 55.06 +71 38 01.9  _{”}
6.10049 22 26 56.86 +71 36 17.0 12.4 Offutt
6.10392 22 26 52.24 +71 36 09.0 12.5  _{”}
6.10675 22 26 48.47 +71 36 01.4 12.4  _{”}
6.10963 22 26 44.58 +71 35 54.6 12.4  _{”}
6.11253 22 26 40.67 +71 35 47.9 12.4  _{”}
6.11587 22 26 36.17 +71 35 40.1 12.5  _{”}
6.48911 22 18 23.61 +71 19 42.4  Endate
6.49730 22 18 12.97 +71 19 21.0  _{”}
6.48976 22 18 23.06 +71 19 43.6  Nakamura
6.49184 22 18 20.32 +71 19 38.3  _{”}
6.49392 22 18 17.60 +71 19 32.7  _{”}
6.50377 22 18 04.65 +71 19 05.8 10.9 Ikari
6.51144 22 17 54.66 +71 18 45.3  _{”}

J. Tichá and M. Tichý (Kleť). 0.57-m f/5.2 reflector + CCD. A. Galád and A. Pravda (Modra). 0.6-m f/5.5 reflector + CCD. P. Pravec (Ondřejov). 0.65-m f/3.6 reflector + CCD. W. Offutt (Cloudcroft). 0.60-m f/7 Ritchey-Chrétien reflector + CCD. K. Endate (Kitami). 0.25-m f/3.4 hyperboloid astrocamera + CCD. A. Nakamura (Kuma). 0.60-m f/6 Ritchey-Chrétien reflector + CCD. Y. Ikari (Moriyama). 0.25-m reflector + CCD.

Visual m_{1} estimates: Oct. 6.07 UT, 9.9 (D. W. E. Green, Lexington, MA, 0.25-m reflector); 6.11, 11.0 (G. W. Kronk, Troy, IL, 0.33-m reflector; 2′ tail in p.a. 130^{o}); 6.17, 10.0 (C. E. Spratt, Victoria, BC, 0.20-m reflector).

1997 October 6  \begin{matrix}c \\ ◯ \end{matrix} Copyright 1997 CBAT  Daniel W. E. Green