Circular No. 5419
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN
 
 
COMET ZANOTTA-BREWINGTON (1991g1)
     Further precise positions have been reported as follows:
 
     1991 UT             R.A. (2000) Decl.       Observer
     Dec. 26.38681   20 53 53.82   +18 06 31.2   Sugie
          26.39306   20 53 55.18   +18 06 22.7     "
          26.77569   20 55 18.67   +17 57 11.7   Vagnozzi
          26.78993   20 55 21.63   +17 56 50.9     "
          28.37589   21 01 13.02   +17 17 35.7   Kobayashi
          28.38878   21 01 15.80   +17 17 15.0     "
 
A. Sugie (Dynic).  0.25-m Schmidt.  Communicated by S. Nakano.
A. Vagnozzi (Stroncone).  0.5-m Ritchey-Chretien.  Comet very diffuse.
T. Kobayashi (Oizumi).  0.16-m reflector + CCD.  Communicated by Nakano.
 
     Parabolic orbital elements from 9 observations Dec. 24-28:
 
     T = 1992 Jan. 31.887 TT          Peri. = 197.719
                                      Node  = 255.100   2000.0
     q = 0.64426 AU                   Incl. =  49.964
 
1991/92     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Dec. 20    20 32.25    +20 24.0    1.182    1.081   59.0   51.3      9.7
     25    20 48.97    +18 38.8    1.118    1.007   56.9   54.9      9.3
     30    21 07.41    +16 35.0    1.052    0.936   54.6   59.0      8.8
Jan.  4    21 27.67    +14 04.9    0.986    0.867   52.3   63.7      8.3
      9    21 49.76    +10 58.9    0.921    0.804   49.8   69.1      7.9
     14    22 13.55    + 7 05.7    0.859    0.747   47.2   75.1      7.4
     19    22 38.69    + 2 14.5    0.804    0.700   44.7   81.4      7.0
     24    23 04.60    - 3 40.7    0.758    0.666   42.5   87.2      6.6
     29    23 30.47    -10 34.6    0.725    0.647   41.1   91.6      6.4
Feb.  3    23 55.49    -18 06.9    0.707    0.646   40.9   93.4      6.3
      8     0 19.09    -25 46.6    0.704    0.662   42.1   92.4      6.4
 
     Total visual magnitude estimates: Dec. 24.71 UT, 9: (M. V.
Zanotta, Laino, Italy, 0.15-m reflector); 24.74, 10.0 (H. Mikuz,
Ljubljana, Slovenia, Yugoslavia, 0.20-m reflector); 25.12, 9.2 (C. S.
Morris, Whitaker Peak, CA, 0.26-m reflector); 25.75, 9.5 (C. Gualdoni
and M. Cavagna, Sormano, Italy, 20 x 80 binoculars; with 0.5-m
reflector a faint, diffuse tail extending 0.1 deg in p.a. 41 deg);
26.80, 10.0 (D. Rodriguez, Madrid, Spain, 0.20-m reflector).
 
 
1991 December 28                                   Brian G. Marsden