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IAUC 3185: 1978c

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                                                  Circular No. 3185
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK     Telex: 921428
Telephone: (617) 864-5758



1978 CA AND 1978 DA
     J. and A. Surdej, European Southern Observatory, report that
UBV photometry was done with the standard photometer on the 100-cm
telescope during Mar. 1d02h-1d08h UT for 1978 CA and during Mar.
2d04h-2d09h UT for 1978 DA.  1978 CA was found to have a rotation
period of 3h43m +/- 3m with a maximum amplitude in V of 0.8 magnitude;
the mean V magnitude was 13.26 +/- 0.02, and the color indices B-V =
+0.90 +/- 0.05 and U-B = +0.48 +/- 0.15 showed no obvious variation.
The observations of 1978 DA showed one clear symmetric maximum of
V = 14.28 at 6h00m UT and one clear minimum of V = 14.62 at 7h50m
UT; for this object B-V = +0.83 +/- 0.05 and U-B = +0.41 +/- 0.15.
Integration times were 15-20 seconds; diaphragm size was 22".


COMET BRADFIELD (1978c)
     D. Herald, Kambah, near Canberra, reports further precise
positions as follows:

     1978 UT             R. A. (1950) Decl.         m1
     Feb.  9.69375    18 54 21.07   -46 33 43.9
           9.70868    18 54 27.04   -46 33 00.6
          11.72153    19 01 42.20   -44 54 22.4
          11.73542    19 07 47.81   -44 53 40.8
          12.72257    19 14 12.63   -44 01 31.7
          12.72639    19 14 13.56   -44 01 24.4
          13.75036    19 20 48.98   -43 04 45.2
          13.75556    19 20 51.51   -43 04 26.9
          19.74375    19 58 06.89   -36 40 34.6     7.4
          19.75035    19 58 09.17   -36 40 10.4

There was a tail 5' long in p.a. 220o on Feb. 19.

     The following total visual magnitude estimates have been
reported: Feb. 20.75 UT, ~ 6 (D. Seargent, The Entrance, New South
Wales, 15 x 80 binoculars; probable tail in p.a. 215o); Mar. 4.50,
5.4 (P. Maley, San Antonio, Texas, 15-cm refractor; somewhat
condensed, very low in twilight); 5.50, 5.3 (Maley).

     UBV photometry by P. Bouchet and J. Surdej at the European
Southern Observatory gives the following (uncertainty +/- 0.2 magnitude,
air mass ~ 3.5): Mar. 1.392 UT, V = 6.2, B-V = +0.4, U-B =
-0.6, diaphragm 88"; 1.399, 7.5, +0.6, -0.3, diaphragm 22".


1978 March 7                   (3185)              Brian G. Marsden

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