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IAUC 4415: 1987q; V1500 Cyg; VY Aqr; 1987h

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IAUC number

                                                  Circular No. 4415
Central Bureau for Astronomical Telegrams
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

     M. P. Candy, Perth Observatory, reports the recovery of this
comet on plates taken by P. Jekabsons and J. Johnston, and measured
by them and A. McGrath, as indicated below.  The object appears
nearly stellar.  The corrections to the predictions on MPC 10520
(ephemeris MPC 11353) and in HBAA 1987, 75, are Delta-T = +2.6 days and
-0.05 day, respectively.

       1987 UT           R. A.   (1950)   Decl.        m2
       July  1.79167    20 18 11.94    -40 51 45.8
             2.70417    20 17 49.30    -40 59 21.0     20
             2.79792    20 17 46.51    -41 00 10.8     20
             6.83264    20 15 48.24    -41 31 59.7

     G. D. Schmidt, P. Smith, and R. Elston, Steward Observatory,
University of Arizona, write:  "Prompted by a recent description of
the optical variability and spectrum of V1500 Cyg (Chlebowski and
Kaluzny, IAUC 4413), we obtained measurements of this object and
find that the optical light (320-860 nm) of the system shows significant
circular polarization (full amplitude about 3 percent), sinusoidally
modulated on the 3.35-hr photometric period.  The results
appear to confirm the suggestion of Chlebowski and Kaluzny that
V1500 Cyg is related to the AM Her-type magnetic cataclysmic
variables. Further study of this system is continuing."

     Visual magnitude estimates:  July 2.730 UT, 11.3 (A. Pearce,
Woodlands, W. Australia); 2.854, 11.5 (Pearce); 4.642, 15.5: (R. H.
McNaught, Siding Spring Observatory); 5.749, [16.0 (McNaught).

     Total visual magnitude estimates:  June 29.45 UT, 13.3: (A.
Hale, Las Cruces, NM, 0.41-m reflector); 30.45, 12.9 (Hale); July
1.44, 12.6 (C. S. Morris, near Mt. Wilson, CA, 0.26-m reflector);
5.41, 11.6 (D. Levy, Tucson, AZ, 0.4-m reflector); 6.32, 12.4 (D.
W. E. Green, Oak Ridge Observatory, 0.41-m reflector); 6.40, 11.9
(Levy); 7.43, 12.8 (Morris).

1987 July 7                    (4415)            Daniel W. E. Green

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