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IAUC 5101: 1990ac; 1990ab; DO Dra; V482 Cyg; P/ENCKE

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IAUC number 

                                                  Circular No. 5101
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


SUPERNOVA 1990ac IN ANONYMOUS GALAXY
     R. H. McNaught, University of Adelaide, reports his discovery
of a supernova in an anonymous galaxy on an R plate taken with the
1.2-m U.K. Schmidt Telescope of the Anglo-Australian Observatory by
P. McKenzie on Sept. 23.74 UT.  The supernova (mag about 18) is
located at R.A. = 3h51m07s.99, Decl. = -29 53'28".5 (equinox 1950.0),
or 1".0 west and 5".5 north of the center of the galaxy.  No image
appears in this position on the ESO R survey film.


SUPERNOVA 1990ab IN ANONYMOUS GALAXY
     M. Phillips, Cerro Tololo Interamerican Observatory, telexes:
"A spectrum (range 585-1000 nm) of SN 1990ab obtained with the
CTIO 1.5-m telescope on Sept. 25 UT shows that this object is a
type-Ia supernova within a few weeks of maximum light.  A redshift
of 0.033 for the parent galaxy was measured from the same spectrum."


DO DRACONIS
     J. A. Mattei, American Association of Variable Star Observers,
reports that this object has undergone its first outburst since
1988 (cf. IAUC 4594), as indicated by the following visual magnitude
estimates:  Sept. 22.9 UT, [13.4 (P. Schmeer, Bischmisheim, W.
Germany); 25.041, 13.5 (G. Dyck, N. Dartmouth, MA); 25.132, 11.5
(Dyck); 25.796, 10.0: (Schmeer).


V482 CYGNI
     Visual magnitude estimates indicate that this R CrB-type
variable is again fading:  July 13.07 UT, 11.9 (P. Schmeer,
Bischmisheim, W. Germany); Aug. 12.03, 11.9 (Schmeer); Sept. 11.97,
12.5 (Schmeer); 17.02, 13.0 (Schmeer); 18.1, 13.0 (J. E. Bortle,
Stormville, NY); 19.91, 13.5 (Schmeer).


PERIODIC COMET ENCKE
     Total visual magnitude estimates (cf. IAUC 5085):  Sept. 10.49
UT, 10.1 (C. S. Morris, Pine Mountain Club, CA, 20x80 binoculars);
16.38, 9.3 (J. E. Bortle, Stormville, NY, 0.32-m reflector); 17.44,
9.5 (A. Hale, Las Cruces, NM, 0.41-m reflector); 21.38, 9.1 (Bortle,
20x80 binoculars); 23.09, 8.8 (R. Haver, Monte Autore, Italy, 15x80
binoculars).


1990 September 25              (5101)             Daniel W. E. Green

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