[IAUC] CBET 1670: 20090125 : SUPERNOVA 2009N IN NGC 4487

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                                                  Electronic Telegram No. 1670
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2009N IN NGC 4487
     S. Nakano, Sumoto, Japan, reports the discovery by Koichi Itagaki
(Teppo-cho, Yamagata) of an apparent supernova (mag 16.6) on unfiltered
30-s CCD frames (limiting mag 19.0) taken on Jan. 24.86 and 25.616 UT using
a 0.30-m f/7.8 reflector at his Takanezawa station (Tochigi-ken).  The
new object is located at R.A. = 12h31m09s.46 +/- 0s.01, Decl. = -8o02'56".3
+/- 0".2 (equinox 2000.0), which is 75" east and 18" north of the center of
NGC 4487.  Nothing is visible at this position on Itagaki's images taken
on 2006 Dec. 19 (limiting magnitude 19.5) and 2009 Jan. 3 (limiting mag 18),
nor on the Digitized Sky Survey.  Itagaki adds that a nearby foreground star
of mag 18 has position end figures 09s.46, 46".9.  Nakano adds that an
unfiltered confirming CCD image of 2009N taken by K. Kadota (Ageo, Japan,
0.25-m f/5 reflector on Jan. 25.632 yields mag 15.8 and position end figures
09s.42, 56".3.  Following posting on the Central Bureau's unconfirmed-objects
webpage, L. Buzzi, Varese, Italy, writes that unfiltered CCD images
(resolution 1".5/pixel; limiting magnitude 18) taken on Jan. 25.153 with a
0.60-m f/4.6 reflector through passing clouds show 2009N at mag 16.0 and
position end figures 09s.44, 56".3 (or 76" east and 18" north of the center
of NGC 4487); Buzzi adds that no star is visible at this position on red,
infrared, and blue Palomar Sky Survey plates (the nearest star being 10".6
west and 3".0 north of the position of 2009N).


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                         (C) Copyright 2009 CBAT
2009 January 25                  (CBET 1670)              Daniel W. E. Green