[IAUC] CBET 1764: 20090414 : SUPERNOVA 2009dd IN NGC 4088

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                                                  Electronic Telegram No. 1764
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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CBAT en CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVA 2009dd IN NGC 4088
     G. Cortini, Predappio, Italy, reports the discovery of an apparent
supernova (mag about 13.7) on several unfiltered CCD images (limiting mag
near 18.5) taken on Apr. 13.97 and 14.82 UT during his supernova search
program with a 0.35-m telescope at the Monte Maggiore Observatory.  The
new object is located at R.A. = 12h05m33s.6 +/- 0s.1, Decl. = +50o32'20"
+/- 3" (equinox 2000.0), which is 2" west and 5" south of the center of
NGC 4088.  Nothing is visible at this position on his image taken on Feb.
19.71 (limiting mag about 18.5) or on red and blue Palomar Sky Survey
plates.  After the object was posted on the Central Bureau's unconfirmed-
objects webpage (based on only the first night's observation by Cortini),
A. Dimai (Cortina d'Ampezzo, Italy) reported an independent discovery
of 2009dd at mag about 13.8 on unfiltered CCD images (limiting mag about
19.0) taken by Elisa Londero (Gemona, Italy) and himself in the course of
the CROSS program (cf. IAUC 7373) with the 0.5-m "Ullrich" telescope on
Apr. 13.05, providing position end figures 34s.10, 18".6 (offset 1" west
and 3" south of the nucleus of the galaxy NGC 4088); confirming images
on Apr. 14.80 yield mag about 13.5 for 2009dd.  A CROSS image of the same
field taken on Feb. 28 showed nothing at the position of 2009dd (limiting
mag about 19.0), and it does not appear on Palomar Sky Survey infrared,
red, and blue plates.  Dimai has posted their discovery image at URL
http://www.cortinastelle.it/cross/SN-NGC4088_20090413.jpg.


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                         (C) Copyright 2009 CBAT
2009 April 14                    (CBET 1764)              Daniel W. E. Green