Central Bureau for Astronomical Telegrams

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IAUC 5039: 1990N; 1990O; 1990P

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                                                  Circular No. 5039
Central Bureau for Astronomical Telegrams
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

     A. Maury, Observatoire de la Cote d'Azur (OCA), reports the
discovery by E. Thouvenot of a supernova in NGC 4639 (R.A. =
12h40m21s, Decl. = +13 31'.9, equinox 1950.0) on a 5-min unfiltered
CCD exposure taken by C. Buil, A. Maury, and L. Brunetto with the
Pic du Midi 0.6-m telescope on June 22.964 UT.  A IIa-O plate taken
by D. Albanese on June 23.93 with the OCA 0.90-m Schmidt telescope
shows the object at mag about 15.5 and located 65" east and 1"
south of the galaxy's center.  Buil, Thouvenot, and G. Prat report
magnitude differences with respect to the discovery frame:  June
23.885, -0.44; 24.89, -0.84; 25.88, -1.18.  An observation on June
25.90 by E. Cappellaro, S. Benetti, and M. Turatto with Asiago
Observatory's 1.8-m telescope at Mt. Ekar yields V = 14.84, R = 14.49
(offset 63".2 east, 1".8 south of the galaxy center).  R. Kirshner
and B. Leibundgut, Center for Astrophysics, report that a spectrum
(range 400-800 nm), obtained on June 26.4 by C. Foltz and J. Pier
with the Multiple Mirror Telescope, resembles that of a classic
type-Ia supernova, though the lines appear broader and smoother
than in other type-Ia objects observed near maximum light, and the
characteristic 615-nm feature extends further toward the blue than
in typical type-Ia SNe, perhaps as a result of observing unusually
fast-moving gas at a very early epoch.

SUPERNOVA 1990O IN MCG +03-44-003
     J. Mueller reports her discovery of a supernova (mag 17) in
MCG +03-44-003 (R.A. = 17h13m.3, Decl. = +16 22', equinox 1950.0),
located 20".2 east and 3".4 south of the galaxy's center.  SN
1990O was found on a blue plate taken June 22 UT in the course of
the second Palomar Sky Survey with the 1.2-m Oschin Schmidt
Telescope. Kirshner and Leibundgut report that a spectrum taken by
Foltz and Pier on June 26.4 suggests that this is also a type-Ia
object, comparable to SN 1989B a few days before maximum light,
though SN 1990O shows none of the peculiarly broad features of SN

     R. H. McNaught reports his discovery of an apparent supernova
on a U.K. Schmidt Telescope R plate taken by S. M. Hughes on June
22.5 UT.  The object (mag 19) is located at R.A. = 16h12m16s.01,
Decl. = -15 28'21".7 (equinox 1950.0), and is 3".6 west and 5".9
north of the galaxy's center.  No image is evident at this location
on J survey films.

1990 June 26                   (5039)             Daniel W. E. Green

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