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IAUC 6850: 1998Y; 1998Z; 1998aa

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                                                 Circular No. 6850
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVA 1998Y IN NGC 2415
     W. Li, M. Modjaz, R. R. Treffers, and A. V. Filippenko,
University of California at Berkeley, report their discovery of a
supernova during the course of the Lick Observatory Supernova
Search (cf. IAUC 6627) with the 0.8-m Katzman Automatic Imaging
Telescope.  SN 1998Y was found and confirmed on unfiltered CCD
images obtained on Mar. 16.2 (mag about 18.3) and 18.2 UT (mag
about 18.4), and it is located at R.A. = 7h36m56s.93, Decl. =
+35o14'36".0 (equinox 2000.0), which is about 7" east and 6" north
of the nucleus of NGC 2415.  An image of the same field taken on
1997 Dec. 22 shows no star at this position.  A spectrum (range
540-920 nm) obtained on Mar. 26 with the Keck-2 telescope by
Filippenko, D. C. Leonard, and A. G. Riess (also of Berkeley) shows
that SN 1998Y is of type II; the prominent H-alpha line has a P-Cyg
profile.


SUPERNOVA 1998Z IN ANONYMOUS GALAXY
     L. Germany and the Mount Stromlo Abell Cluster Supernova
Search Team (cf. IAUC 6639, 6820) reports the discovery of an
apparent supernova (V = 19.6) on V and R CCD images taken on Mar.
16 (limiting mag V = 20.5) by S. Sabine at the Mount Stromlo 1.27-m
telescope (+ Macho Camera).  SN 1998Z is located near Abell 3341 at
R.A. = 5h24m58s.78, Decl. = -31o21'38".1 (equinox 2000.0), which is
1".5 west and 2".3 south of the center of the host galaxy.  SN
1998Z was not visible on similar images taken on Feb. 18 (limiting
mag V = 20.5), but it is present on B, V, R, and I images taken at
the Mount Stromlo 1.88-m telescope on Mar. 22 (limiting mag V = 22).
A nearby star has position end figures 55s.19, 20'19".8.


SUPERNOVA 1998aa IN ANONYMOUS GALAXY
     J. Maza, Department of Astronomy, University of Chile, reports
the discovery by Roberto Antezana of a supernova (B about 18) on a
film (T-Max 400) taken by L. E. Gonzalez using the Maksutov
telescope at Cerro El Roble on Feb. 26.201 UT.  SN 1998aa is
located at R.A. = 12h25m32s.65, Decl. = +7o38'59".0 (equinox
2000.0), which is 10".4 west and 0".8 south of the nucleus of a
spiral galaxy.  The object was confirmed by L. Gonzalez at Las
Campanas using the 1-m Swope telescope on Mar. 9.  On Mar. 24, a
spectrum of the object was obtained by M. T. Ruiz (Department of
Astronomy, University of Chile) using the 3.6-m telescope at the
European Southern Observatory, from which M. Phillips (Cerro
Tololo) classified the spectrum as a normal type-Ia supernova, 35
days after maximum.

                      (C) Copyright 1998 CBAT
1998 March 26                  (6850)            Daniel W. E. Green

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