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IAUC 5087: 1990aa; 1990c; AM Her

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                                                  Circular No. 5087
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505

     S. Perlmutter, C. Pennypacker, S. Carlson, H. Marvin, R. Muller and
C. Smith report that the Berkeley Automated Supernova Search has
discovered a supernova 12" east and 8" south of the nucleus of an
anonymous galaxy at R.A. = 0h50m.2, Decl. = +28D45' (equinox 1950.0).
The object, of mag 17 +/-0.5, was found on three images obtained on
Sept. 4.385, 4.387 and 4.431 UT.  The supernova was not present to
limiting mag 18 (90-percent-confidence) on an image obtained on
Aug. 19.  It is present (but below the detection threshold) on images
from Aug. 25, 28 and Sept. 3.

COMET LEVY (1990c)
     P. Colom, Institut de Radio Astronomie Millimetrique (IRAM); J.
Crovisier, Observatoire de Paris-Meudon; G. Paubert, IRAM, D. Bockelee-
Morvan, Observatoire de Paris-Meudon; and D. Despois, Observatoire de
Bordeaux, report: "We observed the microwave spectrum of comet 1990c
with the IRAM 30-m millimeter telescope from Aug. 26 to Sept. 1.  HCN
was detected through its J = 1-0 and 3-2 transitions at 89 and 267 GHz,
the production rate according to the model of Crovisier (1987, A.Ap.
Suppl. 68, 223) being 7 x 10**25 s-1.  The H2CO J = 3(1,2)-2(1,1)
transition at 226 GHz was detected, the production rate ranging from 6 x
10**25 s-1 for a parent-molecule distribution to 10**27 s-1 for a
daughter-molecule distribution.  A dozen transitions of methanol CH3OH
were detected at 97, 145, 165 and 219 GHz; their relative intensities
suggest a cold rotational temperature (about 30 K) and production rate
1.5 x 10**27 s-1.  H2S was detected through its J = 1(1,0)-1(0,1) and
2(2,0)-2(1,1) transitions at 169 and 217 GHz with production rate 7 x
10**26 s-1.  Our production-rate estimates are preliminary and assume
rotational LTE equilibrium except for HCN.  All the lines are narrow
(1.0 to 1.7 km/s FWHM) and blueshifted by 0.1 to 0.3 km/s, suggesting
anisotropic outgassing toward the sun."

     Visual magnitude estimates: 1989 Nov. 12.77 UT, 14.9 (S. Korth,
Dusseldorf, West Germany); Dec. 3.71, 14.6 (A. Boattini, Florence,
Italy); 1990 Feb. 21.00, 12.8 (Korth); Mar. 26.06, 12.7 (P. Schmeer,
Bischmisheim, West Germany); Apr. 30.11, 13.2 (M. Verdenet, Bourbon-
Lancy, France); 27.93, 15.0 (Korth); June 23.97, [14.6 (A. Pereira,
Caxias, Portugal); Aug. 15.93, 14.9 (Verdenet); 20.89, 14.6 (Verdenet).

1990 September 4               (5087)              Brian G. Marsden

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