[vsnet-alert 4152] a new KAIT SN in IC 454

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

cf. [vsnet-alert 4151] new KAIT sn
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/alert4000/msg00151.html
cf. [vsnet-chart 262] Chart of possible SN in IC454
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-chart/msg00262.html
cf. [vsnet-chat 2664] Host galaxy of possible SN in IC454
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-chat/msg02664.html

Dear SN watchers,

  As reported by Dr. W.D. Li (above), the KAIT team has discovered
their third SN in this year.  There are many foreground stars around
this galaxy, so the observer should be careful in identification.

  The position of the new star is: R.A. = 6h51m07s.67, Decl. =
+12o55'18".5 (2000.0), which is about 19" east of the nucleus of the
inclined barred-spiral (SBab) galaxy IC 454.  It is overimposed on the
northern arm (disk) of the galaxy.

  Because of low galactic latitude (b = 5.8), there are many
foreground stars superimposed on IC 454.  Some stars are not included
in USNO_A2.0 catalog, even though it is quite bright (about 14 mag).  
Offsets from nucleus of brighter ones are tabled.

A  13"W, 9"N  about 14 mag, on the NW end of the bar, not in USNO
B   2"E,15"N  about 15.5 mag, on the northern arm, not in USNO
C  20"E,23"S  about 16.5 mag, USNO_A2.0 0975_04030093
D  36"W,19"S  about 15.5 mag, USNO_A2.0 0975_04027401
E  23"W,17"N  about 16.5 mag, USNO_A2.0 0975_04028086

There are additional stars around 18 mag.  The reported magnitudes
of this SN is:

20000108.2  >200C
20000127.2   190C
20000202.2   180C
20000208.22  173C

, indicating that it is pre-maximum or near maximum.  

  The recession velocity of the host galaxy is about 4000 km/s, from
which the expected SNIa maximum without reddening is about 15.3 mag.
While the Galactic extinction is not so large (A_V = 0.76) for such
low b as this, the absorption in the host galaxy should be some.  

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

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