Central Bureau for Astronomical Telegrams
IAUC 5191: 1991I; 3C 345; 1991 CQ
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Read IAUC 5192
Circular No. 5191
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 1991I IN ANONYMOUS GALAXY
R. H. McNaught, University of Adelaide, reports his discovery,
on a U.K. Schmidt Telescope R plate taken Feb 14.46 UT by K. S.
Russell, of a supernova (mag about 18.5) situated about 1" north of
an anonymous galaxy with no well-defined center. The supernova is
at R.A. = 5h25m17s.20, Decl. = -52 16'01".9 (equinox 1950.0). No
image appears in this position on the ESO R or B, nor the SERC J,
surveys. A nearby star of mag about 16 is at R.A. = 5h25m15s.26,
Decl. = -52 16'07".4.
M. Della Valle and L. Pasquini, European Southern Observatory;
and M. Turatto, Osservatorio Astronomico di Padova, communicate:
"The preliminary analysis of a spectrogram (range 370-700 nm, resolution
about 2.0 nm), taken on Feb. 17.3 UT with the 3.6-m telescope
(+ EFOSC) at La Silla, shows this to be a type-II supernova. The
spectrum exhibits a broad H-alpha emission (FWZI = 23.5 nm) at 680
nm, coupled with an extremely weak P-Cyg absorption. No other
features stand out. The magnitude derived from the flux calibrated
spectrum is V about 19.0. Assuming the H-alpha emission line at the
rest wavelength in the galaxy's frame, a redshift of z about 0.036
was estimated from the same spectrum."
3C 345
J. Schramm and U. Borgeest, Hamburg Observatory, telex: "Since
1988 August, we have carried out CCD photometric monitoring of 3C
345 in the R band at the 1.23-m telescope at Calar Alto, measuring
the flux of 3C 345 relative to the stars in the frame. Our lightcurve
consists of 63 data points, more or less equidistantly distributed.
Besides small variations of the order of a few tenths of a
magnitude, 3C 345 was quiet until 1990 August. Since then, its flux
has increased almost exponentially until our last measurement on
1991 Feb. 16.17 UT, with a total amplitude of 1.5 mag, and seems not
to be at the maximum. The increase of the last 24 hr was 0.3 mag."
1991 CQ
Corrigendum. Concerning the discovery announcement on IAUC
5186, McNaught notes that the Feb. 10 (discovery) and 12 positions
were from U.K. Schmidt Telescope plates taken by K. S. Russell. The
Feb. 11 position was from an Uppsala Southern Schmidt film.
1991 February 19 (5191) Daniel W. E. Green
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