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IAUC 3105: 1977m; CH Cyg

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                                                  Circular No. 3105
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


COMET KOHLER (1977m)
     The following precise positions have been reported:

     1977 UT             R. A. (1950) Decl.        Observer
     Sept. 7.12292    15 28 09.18   +28 41 06.1    Giclas
           7.21007    15 28 18.71   +28 39 28.3    Harlan
           8.15625    15 30 02.86   +28 21 38.8      "
           9.15382    15 31 55.07   +28 02 29.5    Giclas
           9.8785     15 33 18.24   +27 48 14.0    Waterfield

H. L. Giclas (Lowell Observatory).  Measurer: M. L. Kantz.
E. A. Harlan (Lick Observatory).  Measurer: A. R. Kiemola.
R. L. Waterfield (Woolston Obs.).  Communicated by S. W. Milbourn.

     Total visual magnitude estimates: Sept. 8.16 UT, 10.2 (R. Hill,
Greensboro, North Carolina, 15-cm reflector); 8.20, 9.8 (P. Collins,
Steward Observatory, 20 x 120 binoculars); 10.17, 11.1 (Hill);
11.41, 10.8 (B. Sumner, Townsville, Queensland, 15-cm reflector).

     The following sets of parabolic orbital elements have been derived.
The ephemeris is from the former set.

                 B. G. Marsden          S. W. Milbourn
               (5 obs. Sept. 6-9)     (3 obs. Sept. 6-9)
           T =  1977 Nov. 10.510      1977 Nov. 8.896 ET
       Peri. =  163.473               163.58
       Node  =  181.831               182.39   1950.0
       Incl. =   48.713                48.50
           q =    0.99041               0.9781

     1977 ET     R. A. (1950) Decl.     Delta     r      m1
     Sept. 4    15 22.71    +29 38.4    1.554   1.493   10.7
          14    15 41.63    +26 25.3    1.459   1.380   10.2
          24    16 05.01    +22 37.6    1.355   1.274    9.7
     Oct.  4    16 33.29    +18 02.3    1.247   1.178    9.2


CH CYGNI
     J. Bortle, Editor of the AAVSO Circulars, points out that the
current outburst (cf. IAUC 3101) began with a surge from mv 7.7 to
7.0 during April and that mv averaged a peak value of 6.8 in June.
AAVSO observations also show that mv averaged 6.8 in Oct. 1972.


1977 September 12              (3105)              Brian G. Marsden

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