THE ASTRONOMER Electronic Circular No 656 1992 August 4 20.00 UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise, Basingstoke,
Hants, RG22 4PP,England. Telephone/FAX(0256)471074 Int:+44256471074
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SUPERNOVA 1992ao IN NGC 7637
R. H. McNaught, Anglo-Australian Observatory, reports his dis-
covery of a supernova (mag about 17) in NGC 7637 on an R plate tak-
en by Q. A. Parker with the U.K. Schmidt Telescope on July 28.65
UT. The supernova is located at R.A. = 23h23m06s.54, Decl. =
-82 10'15".6 (equinox 1950.0, uncertainty in each coordinate 0".4),
or 53".5 east and 56".7 north of the galaxy's center. A nearby
star of similar brightness has end figures 01s.37, 09'51".3.
M. Della Valle, European Southern Observatory; and R. Gilmozzi,
Space Telescope Science Institute, report: "Flux-calibrated CCD
spectra (range 390-800 nm, resolution about 1.8 nm) obtained on
July 31.3, Aug. 1.3, and 2.3 UT, with the 3.6-m and 2.2-m tele-
scopes (+ EFOSC) at La Silla, show this object to be a type-II sup-
ernova at an early stage.
IAUC 5573
SUPERNOVA 1992ap IN UGC 10430
K. Birkle, Max-Planck Institut fur Astronomie, Heidelberg, re-
ports his discovery, on a IIIa-J plate taken July 29 with the Calar
Alto 0.80-m Schmidt telescope, of a supernova (mag B about 18) in
UGC 10430 (R.A. = 16h28m47s.6, Decl. = +41 25'25", equinox 1950.0).
SN 1992ap, not visible on the Palomar Sky Survey print but con-
firmed on a IIIa-F plate by Birkle, is superimposed on one of the
arms of this SB(rs)bc galaxy, located 7" east and 16" north of the
galaxy's center. A CCD image taken July 30 with the Calar Alto
3.5-m telescope by G. Thimm through an R filter shows that SN
1992ap is as bright as the bulge of the host galaxy. On Aug. 1, P.
Belloni, H.-J. Roser, and U. Hopp used the prime-focus focal reduc-
er system of the Calar Alto 3.5-m telescope to take a CCD-grism
spectrum, which clearly shows the features of a type-I supernova,
perhaps 2 weeks past its maximum.
IAUC 5573
SUPERNOVAE 1992aq AND 1992ar IN ANONYMOUS GALAXIES
M. Hamuy, Cerro Tololo Interamerican Observatory; and J. Maza,
University of Chile, report the discovery by R. Antezana (Universi-
ty of Chile) of two supernovae of mpg about 19; SNe 1992aq and
1992ar were found on 20-min unfiltered IIa-O plates taken on July
26.218 and 27.233 UT, respectively, by L. Wells and C. Muena (CTIO)
with the CTIO Curtis Schmidt telescope. SN 1992aq is located about
2".3 east and 6".9 south of the nucleus of a galaxy at R.A. =
23h01m49s, Decl. = -37 36'.8, equinox 1950.0). A spectrogram
(range 320.0-750.0 nm) of SN 1992aq was obtained by R. Williams
(CTIO) and Hamuy on Aug. 2.26 with the CTIO 4-m telescope, showing
that this is a type-Ia supernova near maximum light; the redshift
of the nucleus of the parent galaxy is 0.101. SN 1992 ar (R.A. =
23h14m42s, Decl. = -44 55'.3, equinox 1950.0) is located at the
southern edge of a small group of three galaxies; its position is
1".5 west and 5".3 south of the eastern-most galaxy. A spectrogram
(range 320-750 nm) of SN 1992ar, obtained by Williams and Hamuy on
Aug. 2.65 with the CTIO 4-m telescope,suggest this is a type-Ic event
at maximum light.
IAUC 5574
Martin Mobberley (Assistant Editor)