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IAUC 4513: 1987s; 1987N; OS And

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                                                  Circular No. 4513
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


COMET BRADFIELD (1987s)
     D. K. Lynch and R. W. Russell, Space Sciences Laboratory, The
Aerospace Corporation, write: "We made infrared observations of
comet 1987s using the NASA Infrared Telescope Facility's 3-m telescope
(9".5 aperture, lambda/dlambda = 50 CVF, 60" chop).  On Dec. 3.1 and
4.1 UT, the CVF spectrum shows, relative to Beta and 35 Peg, a silicate
emission feature with shoulders at 9.2 and 11.3 microns.  Neither
the shape nor brightness of the feature varied to +/- 10 percent.
On Dec. 4.1 the comet's magnitudes were K = 8.26, L = 6.31, N =
4.14, N' [10.3 microns] = -0.43.  The 3.5/4.8-micron color temperature
is significantly higher than the equilibrium temperature, suggesting
submicron-size grains.  Observations of the coma 10" east of
the nucleus show silicate emission identical in shape to but a
factor of four fainter than that of the inner coma."
     Total visual magnitude estimates: Dec. 6.42 UT, 5.6 (Y. Sugiyama,
Hiratsuka, Japan, 0.16-m reflector); 7.73, 5.7 (J. Shanklin,
Cambridge, England, 10 x 80 binoculars; broad tail 1.8 deg long in p.a.
81 deg, width 40 deg); 8.73, 5.6 (P. Schmeer, Bischmisheim, West Germany,
20 x 80 binoculars); 9.98, 5.7 (J. DeYoung, Washington, DC, 9 x 63
binoculars); 11.09, 5.8 (C. E. Spratt, Victoria, BC, 11 x 80
binoculars); 12.07, 5.8 (R. Keen, Mt. Thorodin, CO, 8 x 40 binoculars;
4.5-deg tail in p.a. 55 deg); 13.10, 5.9 (Spratt); 14.11, 5.8 (C. S.
Morris, La Canada, CA, 20 x 80 binoculars); 15.09, 5.7 (Spratt).


SUPERNOVA 1987N IN NGC 7606
     R. H. McNaught, Siding Spring Observatory, communicates the
following precise position from a 103a-O exposure by K. Jones, P.
Milford and A. A. Page with the Uppsala Southern Schmidt telescope
on Dec. 14.5 UT: R.A. = 23h16m27s.79, Decl. = -8 45'02".9 (equinox
1950.0; offsets from nucleus 16".6 west, 29".1 north.
     Visual magnitude estimates at Siding Spring Observatory: Dec.
15.41 UT, 13.9 (T. Cragg); 15.50, 14.1 (R. H. McNaught).


OS ANDROMEDAE
     Visual magnitude estimates: Nov. 11.84 UT, 13.1 (R. Monella,
Covo, Italy); 12.83, 13.1 (Monella); 15.84, 13.2 (Monella); 15.9,
13.3 (A. Mizser, Budapest, Hungary); 18.8, 13.4 (Mizser); 20.8,
13.5 (Mizser); 21.88, 14.2 (Monella).


1987 December 15                (4513)             Brian G. Marsden

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