651007Announcement11_p2

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Comet and Nova Section - Announcement #11                                       -2-


Since this comet could undergo unexpected changes, members are asked to make as
many observations as possible and report them to the undersigned.    Since cir-
culation of this announcement is limited, would you please inform other members
of the Society about this comet.

Hugh N.A. Maclean of the Niagara Falls Centre reports on an observation of Comet
Ikeya-Seki an October 3:

  "Brightness estimate was 5.0. The Comet's position at 10:30 U.T. Oct.3, was:
   R.A. 09h 57m; Decl. -12° 40'.  The nucleus was bright, but not starlike in
   8" 'scope.   The Coma was small; I would guess around 6' to 8'."


COMET ALCOCK (1965h)

This comet is in the evening sky during the next month and should be visible in
small telescopes. The following ephemeris was obtained from I.A.U. Circular 1926,
and the magnitudes were determined by the undersigned from:
       Mag. = 8.5 + 51og (dist. from earth) + 15log (dist. from sun).
Magnitudes will be approximate, at best.

                    1965     R.A.1950   Decl.    Mag.
                   00h U.T.
                   Oct.  7   17.34.4   +27 15    10.7
                        12   17 55.1   +22 50    10.6
                        17   18 16.1   +18 06    10.5
                        22   18 37.3   +13 12    10.4
                        27   18 58.4   +08 14    10.4
                   Nov.  1   19 19.2   +03 23    10.5
                         6   19 39.7   -01 14    10.6


PERIODIC COMET DeVICO-SWIFT (1678, 1844I, 1894IV, 1965e)

This comet was recovered last July, and is about three to four magnitudes fainter
than predicted in "Bulletin #6", so it will not be visible in small telescopes.


NOVA HERCULIS, 1963

This nova is now declining very slowly in brightness. Mr. Maclean of the Niagara
Falls Centre estimated the magnitude at 13.8 on August 24, 1965.  The position
of this nova is R.A. 18h 12m 46s, Decl. 41° 50.'4 (1950).


                Members may have copies of the instruction forms
                                   upon request.



                                              Jim Low, National Coordinator,
                                              Comet and Nova Section,
                                              Standing Committee an Observational
                                                               Activities,
                                              108 Roy Avenue, Apt. 102,
October 7, 1965.                              Dorval, P.Q.