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IAUC 2276: P/ENCKE; 1970c

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IAUC number 

                                                  Circular No. 2276
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
Western Union: RAPID SATELLITE CAMBMASS


PERIODIC COMET ENCKE
     Dr. Z. Sekanina, Smithsonian Astrophysical Observatory, reports
an attempt to give a brightness ephemeris for this comet.
The predicted magnitudes are total, in the international photo-visual
system, and refer to observations made by the method applied
by M. Beyer (1933, Astron. Nachr. 250, 233).  The prediction is
based on an analysis of Beyer's preperihelion observations at the
apparitions of 1937, 1947, 1951 and 1961.  The ascertained secular
decrease, on the average 0.1 magnitude per revolution, has been
taken into account.  The postperihelion prediction is very uncertain;
it is based mostly on the 1964 apparition and reflects the
indisputable perihelion asymmetry in the comet's light curve.

               1970 ET    m1         1970/71 ET  m1
               Oct. 21   14.0        Dec. 20     7.0
                    31   12.5             30     6.7
               Nov. 10   11.1        Jan.  9     7.1
                    20    9.8             19   > 9
                    30    8.7             29   >12
               Dec. 10    7.8        Feb.  8    15?


PERIODIC COMET KOPFF (1970c)
     The following precise positions have been reported:

     1970 UT             R. A. (1950) Decl.        Observer
     June 29.89487    13 10 25.00   - 1 01 45.1    Mrkos
     July  1.92064    13 12 28.81   - 1 21 23.2      "
           2.89091    13 13 30.83   - 1 31 01.6      "
           7.90166    13 19 16.13   - 2 23 19.4      "
          27.49375    13 48 11.30   - 6 18 48.0    Gans
          29.48438    13 51 39.67   - 6 44 54.5    Birch
     Aug.  6.46632    14 06 32.08   - 8 32 24.7    Candy
          13.48611    14 20 48.43   -10 08 56.0      "
          13.49236    14 20 49.28   -10 09 30.8      "

A. Mrkos (Klet Observatory).
D. Gans, P. V. Birch and M. P. Candy (Perth Observatory, Bickley).
   33-cm f/10 astrograph.


1970 September 4               (2276)              Brian G. Marsden

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