[vsnet-alert 5777] New SN in the very neighbouring galaxy

[Hitoshi YAMAOKA <yamaoka@rc.kyushu-u.ac.jp>]

Dear SN watchers,

  A nearby SN is discovered by the KAIT telescope.  The host galaxy
NGC 3504 has procuded SN 1998cf.  

  A new object has discovered and confirmed on Mar 12.4 UT and 13.3
UT, respectingly, at mag about 18.2.  It cannot be caught a month ago
(limiting mag about 19.0).  The position is R.A. = 11h03m15s.37, Decl.
= +27o58'29".5 (2000.0), which is about 55" east and 9" north of the
bright nucleus of the starburst galaxy ((R)SAB(s)ab) NGC 3504.  This
host galaxy has a bright bar and very faint arm, and the new SN
locates on the eastern arm.  There is an bright (mag about 15)
foreground USNO_A2.0 star at position end figures 13s.92, 10".4, whose
offset from the nucleus is about 34" east and 11" south.  

  The recession velocity suggest that the typical unreddened SN Ia on
this galaxy can reach mag 13 or so.  But it has remained the same
magnitude two days (not so young) and the multicolor images taken by
discoverer shows that this object is not blue.  These things indicate
that this SN seems to be highly reddened by the intersteller matter,
or it possibly be a quite dim SN.  It would be important, however, to
see how it will change magnitude in these days.

Sincerely Yours,
Hitoshi Yamaoka, Kyushu Univ., Japan
yamaoka@rc.kyushu-u.ac.jp

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