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IAUC 4371: 1987D; 1986l; N Her 1987; 1982i

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                                                  Circular No. 4371
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

SUPERNOVA 1987D IN MCG +0-32-01
     G. M. Hurst, Basingstoke, England, communicates the following
precise position obtained on Apr. 22.997 UT by A. Young (0.6-m
reflector, Royal X pan film):  R.A. = 12h17m07.55, Decl. = +2 21'05.6
(equinox 1950.0), mpv = 13.

     J. R. Ducati and R. D. D. Costa, Instituto de Fisica, Universidad
Federal Rio Grande do Sul, Porto Alegre, telex:  "We report
photometry of molecular bands obtained Apr. 16, 18, and 19 at Cerro
Tololo Interamerican Observatory with the 0.6-m Lowell telescope
using a 50" diaphragm centered on the comet's nucleus.  Ratios of
intensities of  molecular  bands  to  neighboring continua are:  C3
(514 nm/485 nm): 3.30; H2O+ (700/684): 2.00; CO+ (406/365): 5.07;
C2 (426/365): 2.06.   The strong emission of CO+ in this comet
contrasts with that in P/Halley, where it was almost absent."

     R. D. Gehrz and T. J. Jones, University of Minnesota, report:
"Nova Her 1987 appears to have entered a dust formation phase, based
on observations obtained with the 2.34-m Wyoming Infrared Telescope.
Rough magnitudes for Apr. 23.48 UT are [2.3 microns] = 6.8, [3.6 microns]
= 5.1, [4.9 microns] = 4.3, [8.7 microns] = 3.4, [10 microns] = 3.7,
[11.4 microns] = 3.4, [12.6 microns] = 2.3, [19.5 microns] = 3.0.  There
is evidence for strong [Ne II] emission at 12.8 microns.  The dust
temperature is 1000 K."
     Visual magnitude estimates, provided in part by J. A. Mattei,
AAVSO:  Mar. 17.16 UT, 10.1 (A. Pereira, Linda-A-Velha, Portugal);
22.38, 10.1 (L. Hiett, Arlington, VA); Apr. 1.15, 10.4 (M.
Verdenet, Bourbon-Lancy, France); 9.10, 10.8 (Pereira).

     Further total visual magnitude estimates:  Apr. 5.90 UT, 14.2
(R. Fleet, Harare, Zimbabwe, 0.52-m reflector); 18.78, 14.5
(Fleet); 20.21, 13.3 (C. S. Morris, 0.26-m reflector, Lockwood
Valley, CA); 21.83, 13.6 (Fleet; outburst suggested); 23.20, 12.7:
(A. Hale, Las Cruces, NM, 0.20-m reflector).

1987 April 23                  (4371)            Daniel W. E. Green

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