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IAUC 3740: SN IN NGC 1187; TY Psc; SU Tau; 1982g

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IAUC number 

                                                  Circular No. 3740
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 617-864-5758


SUPERNOVA IN NGC 1187
     A. Muller, European Southern Observatory, telexes that further
photometry by B. E. Westerlund on Oct. 25 gives preliminary
results as follows: with respect to the sky background close to
the supernova, V = 14.37, B-V = +0.58, U-B = -0.43, V-R = +0.16,
V-I = +0.21; with respect to distant sky, 14.24, +0.45, -0.16,
+0.31, +0.24.  Low-dispersion red spectra obtained by M. Dennefeld
on Oct. 26 show two broad emission bands around 535 and 660 nm and
the absence of absorption at 615 nm.  This also indicates that the
supernova is of type I about 20 days after maximum.  The spectra,
taken four hours apart, show no variability.  J. Koornneef obtained
the following near infrared magnitudes on Oct. 27.12 UT; J = 14.0,
H = 14.2, K = 13.9.  The comparison star was HR 1007 (J = 4.42,
H = 4.11, K = 4.01).  This suggests a blackbody temperature
of ~ 8000 K and no indication that a dust shell has formed.


TY PISCIUM
     J. Mattei, AAVSO, informs us that this suspected SU-UMa-type
variable is undergoing a supermaximum.  Visual magnitude estimates
are: Oct. 24.1 UT, [14.0 (G. Chaple, Townsend, MA); 25.1, 12.2
(Chaple); 26.2, 12.0 (T. Butler, Silex, MO); 27.2, 11.8 (P. Goodwin,
Shreveport, LA).  A search for superhumps with high-speed
photometry is strongly recommended.


SU TAURI
     J. Mattei, AAVSO, communicates the following visual magnitude
estimates: Oct. 19.21 UT, 10.4 (E. Mayer, Barberton, OH); 23.21,
11.5 (Mayer); 23.24, 11.9 (P. Collins, Cambridge, MA); 25.41, 12.1
(P. Sventik, Houston, TX); 26.42, 12.4 (Sventek).  This R-CrB-type
variable is fading; it last faded in 1979 Sept. (IAUC 3407).


COMET AUSTIN (1982g)
     Total visual magnitude estimates: Sept. 24.15 UT, 7.9 (C. E. Spratt,
Victoria, BC, 0.20-m reflector); 30.13, 8.2 (Spratt); Oct. 3.11, 8.6
(Spratt); 6.00, 8.5 (J. E. Bortle, Stormville, NY, 0.32-m reflector);
10.99, 8.8 (Bortle); 18.39, 9.5 (Bortle); 20.40, 9.7 (Bortle); 23.40,
9.9 (Bortle); 27.40, 10.1 (Bortle).


1982 October 29                (3740)              Brian G. Marsden

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