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IAUC 4616: CH Cyg; 1987b1

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                                                  Circular No. 4616
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
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


CH CYGNI
     P. Garnavich and J. Goldader, University of Washington, provide
the following photometry (Johnson U, B, V and Smith r bandpasses) of
CH Cyg (cf. IAUC 4605), obtained with the 0.8-m telescope at the
Manastash Ridge Observatory: June 11.4 UT, V = 8.65, V-r = +2.86, B-V
= +1.53, U-B = +0.88; 13.4, 8.67, +2.83, +1.57, +0.85.  The colors are
consistent with those of a standard M6 III star (Johnson 1966, Ann.
Rev. Astron. Ap. 4, 196): V-r = +2.80, B-V = +1.54, U-B = +0.89.  From
1968 to 1984 flickering had been observed in this star with greatest
amplitude 15 percent in U.  The present results, obtained over a
period of five hours on each night, show the star to be of constant
brightness in all bands to 3 percent.


COMET McNAUGHT (1987b1)
     Continuation to the ephemeris on IAUC 4581:

     1988 ET      R.A. (1950) Decl.     Delta      r       m1
     June 28     6 01.97    +57 36.0    3.905    3.122    13.4
     July  8     6 17.52    +57 05.6
          18     6 31.45    +56 43.1    4.092    3.354    13.8
          28     6 43.81    +56 28.6
     Aug.  7     6 54.62    +56 22.6    4.196    3.581    14.2
          17     7 03.82    +56 25.3
          27     7 11.26    +56 37.2    4.223    3.803    14.4
     Sept. 6     7 16.77    +56 58.4
          16     7 20.09    +57 28.7    4.188    4.021    14.7
          26     7 20.87    +58 07.7
     Oct.  6     7 18.74    +58 53.8    4.115    4.234    14.8
          16     7 13.24    +59 44.4
          26     7 04.01    +60 35.3    4.041    4.443    15.0
     Nov.  5     6 50.84    +61 20.7
          15     6 33.90    +61 53.6    4.011    4.649    15.2
          25     6 13.97    +62 06.8
     Dec.  5     5 52.46    +61 54.7    4.067    4.851    15.4

     Total visual magnitude estimates: Apr. 11.14 UT, 10.4 (R. Keen,
Mt. Thorodin, CO, 0.32-m reflector); 19.17, 10.7 (A. Hale, Las Cruces,
NM, 0.41-m reflector); May 4.17, 11.8 (Hale; extremely diffuse).


1988 June 22                   (4616)              Brian G. Marsden

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