[vsnet-alert 3592] SN 1999eh in NGC 2770

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

Dear SN watchers,

  English amateur M. Armstrong has discovered another supernova
successively!  Congratulations again, Mark!

  Accorgind to IAUC 7282, SN 1999eh has found and confirmed on Oct.
12.138 and 14., respectingly.  The magnitudes on both epoch were about
17.5C. The position measured by discoverer is: R.A. = 9h09m32s.67,
Decl. = +33o07'16".9 (2000.0), which is about 20" west and 5" south of
the center of inclined Sc galaxy NGC 2770.  Mark has measured the
position with confirmation image taken by T. Boles of which end
figures 32s.55, 16".3.  The diffence of the position is rather small.
The reported offset is, however, somewhat questionable: if the
reported positions are correct, the offset from the center of the host
galaxy should be about 12-3" west and 9-10" south.  

  There are two confusing foreground stars, whose magnitudes are
similar to that of SN 1999eh.  One of which, whose offset is 23" west
and 4" south, can be the reason of the confusion in offset.  The
offset of another foreground star ls 13" west and 22" south. 

  The spectroscopy by CfA group has revealed that SN 1999eh is type Ib
event about 2 months (not weeks) past maximum.  The maximum should
have missed during the object has been behind the sun.  If you have
archived images taken after May or June, it is valuable to seek the
pre-discovery (or negative).  Note that type Ib event is rather rare
one in these days (after type Ic event is separated). 

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

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