Central Bureau for Astronomical Telegrams
IAUC 5534: 1992aa; 1992ab; N Cyg 1992
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Circular No. 5534
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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)
SUPERNOVA 1992aa IN NGC 6464
Jean Mueller reports her discovery of a supernova in NGC 6464
(R.A. = 17h45m.2, Decl. = +60 55', equinox 1950.0), found on a
plate taken by J. D. Mendenhall and herself on May 10 UT with the
1.2-m Oschin Telescope in the course of the second Palomar Sky
Survey. SN 1992aa was then at red mag about 18 and is located 11"
south of the galaxy nucleus, on a spiral arm. A confirming spectrogram
was obtained on June 3 by M. Ashby and J. R. Houck with the
5-m Hale Telescope (+ double spectrograph), the spectrum showing
the broad H-alpha and H-beta indicative of a supernova.
SUPERNOVA 1992ab IN NGC 6389
Mueller also reports her discovery of a supernova in NGC 6389
(R.A. = 17h30m.5, Decl. = +16 26', equinox 1950.0), found on a
plate taken by C. Brewer and J. D. Mendenhall on June 1 UT with the
1.2-m Oschin Telescope in the course of the second Palomar Sky
Survey. SN 1992ab was then at red mag about 17 and is located 80"
east and 20" south of the galaxy nucleus. A confirming spectrogram
was obtained on June 4 by Ashby and Houck with the 5-m Hale
Telescope (+ double spectrograph).
NOVA CYGNI 1992
P. E. Pavelin and R. J. Davis, University of Manchester,
Jodrell Bank; L. V. Morrison, Royal Greenwich Observatory; and M.
F. Bode, Liverpool Polytechnic, report detection of 6-cm radio
emission from Nova Cyg 1992 using the newly enhanced Merlin array
on May 9. The source position was measured with respect to the
VLBI point source 2031+549. Preliminary mapping shows the source
to be extended with a peak intensity in a 50-mas beam of 280 +/- 50
microJy at the following position: R.A. = 20h30m31s.6580, Decl. =
+52 37'50".928 (equinox J2000.0, epoch 1992.4, +/- 0".005). The
integrated flux of the source is 1360 +/- 50 microJy. An optical
position for the nova has been measured with the Carlsberg AMC at
La Palma: R.A. = 20h30m31s.674, Decl. = +52 37'50".90 (same equinox
and epoch, +/- 0".10).
Additional visual magnitude estimates (cf. IAUC 5533): June
3.24 UT, 7.8 (R. Donner, Santa Barbara, CA); 3.44, 8.3 (W. G.
Dillon, Missouri City, TX).
1992 June 4 (5534) Daniel W. E. Green
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