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IAUC 4099: 1985 PA; 1984e

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                                                  Circular No. 4099
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444


1985 PA
     Ephemeris from the orbital elements on IAUC 4098:

     1985 ET     R.A. (1950.0) Decl.      p        r      Mag.

     Aug. 28    22 05.01    -25 45.7
     Sept. 2    21 51.31    -32 09.8    0.585    1.553    16.7
           7    21 36.88    -37 59.4
          12    21 22.35    -43 02.2    0.633    1.514    17.1
          17    21 08.40    -47 14.4
          22    20 55.67    -50 39.3    0.712    1.473    17.5
          27    20 44.67    -53 23.7
     Oct.  2    20 35.70    -55 35.5    0.805    1.431    17.8
           7    20 28.94    -57 21.6
          12    20 24.45    -58 48.2    0.901    1.387    18.0
          17    20 22.21    -60 00.0


PERIODIC COMET GIACOBINI-ZINNER (1984e)
     A. L. Cochran and E. Barker, University of Texas, report: "We
observed P/Giacobini-Zinner with the IDS spectrograph on the 2.7-m
telescope at McDonald Observatory on Aug. 15.  Visually, the comet
was elongated east-west.  Spectra were obtained on the brightest
part of the image and 26" and 52" east and west of the brightest
point.  CN and C2 column densities were symmetric around the
center while C3 and CH were only detected on the east side of the
center.  Haser model production rates were determined as follows:
log Q(CN) = 25.3, log Q(CE) = 24.1, log Q(CW) = 25.2."

     Selected total visual magnitude estimates: July 23.94 UT,
10.2 (J. D. Shanklin, Cambridge, England, 0.20-m reflector; tail
3' in p.a. 270); 27.41, 8.3 (C. S. Morris, Table Mountain
Observatory, 20 x 80 binoculars; tail 21' long in p.a. 242); Aug.
3.07, 8.6 (J. Bortle, Stormville, NY, 0.32-m reflector, tail 7' in
p.a. 240); 7.90, 8.1 (J.-C. Merlin, Le Creusot, France, 0.40-m
reflector); 11.22, 8.2 (C. E. Spratt, Victoria, BC, 0.20-m reflector;
tail 3' in p.a. 270); 12.40, 8.1 (Morris, tails 50' in p.a.
264 and 275); 14.98, 8.6 (M. Cavagna, near Aosta, Italy, 10 x 50
binoculars; tail 21' in p.a. 270); 17.16, 7.7 (Bortle, Springfield,
VT, 25 x 150 binoculars; tail 18' in p.a. 275P); 22.25, 8.3
(Spratt, tail 2' in p.a. 265P); 23.36, 7.8 (J. DeYoung, Alexandria,
VA, 0.25-m reflector, tail 20' in p.a. 274); 25.44, 7.4
(Morris, Mt. Waterman, CA; tail 40' in p.a. 275).


1985 August 28                 (4099)              Brian G. Marsden

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