[vsnet-alert 3574] SN 1999ee and others

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

Dear SN watchers,

  After vsnet-alert 3553, there has been discovered four supernovae;
1999ed, 1999ee, 1999ef, and 1999eg.  Among them, SN 1999ee is expected
to become as bright as 14.5 mag, as noted on IAUC 7272.

  SN 1999ee was discovered on Oct. 7.15 by the group in the University
of Chile.  The position reported in IAUC 7272 is: R.A. = 22h16m09s.40,
Decl. = -36o50'31".5 (2000.0), which is about 10" east and 10" south
of the nucleus of Sbc galaxy IC 5179.  This position is somewhat
questionable: possibly either the position of SN and that of the
nucleus of the host are wrong.  From Jean Claude Pelle's image
(http://aude.geoman.net/observation/SN/images/s99eePE2.gif), the rough
position is 22h16m10s, -36o50'41" (2000.0), which is about 10" east
and 3" south of the nucleus of the host, and overposed on the
innermost of the disk.  More presice astrometry should be needed. 

  The reported magnitudes are: 
Oct.  7.15   17.5pv (IAUC)
Oct. 10.46   163C   (Pelle)
, which suggests that it is in rising phase, consistent with the
reported spectrum on IAUC 7272.

  The host galaxy is Sbc one, whose recession velocity is about 3400
km/s.  The reported spectrum tells that it is of type Ia, and the sign
of absorption is not mentioned.  The typical unscattered SNeIa on this
distance would become 14.5 mag or so on their maximum, as noted by
discoverers. 

  Other three supernovae are seems not to become as bright as 16 mag. 
SN II 1999ed was found in the (probably) interacting galaxy UGC 3555
(with small Sm galaxy), which resembles to Messier 51.  The confusing
stars are there, so please be careful in identification.  The
discovery image http://astron.berkeley.edu/~bait/1999/sn99ed.html is
good finding chart, though it is turned over on north-south.

  SN 1999ef is somewhat distant (v_r = 11641 km/s) SN Ia past maximum.

  SN 1999eg has discovered by English amateur M. Armstrong.  It is his
5th discovery.  Congratulations, Mark!  The position of SN 1999eg is
reported as R.A. = 2h53m08s.39, Decl. = +25o29'24".2 (2000.0) on the
latest image; which is slightly different from that on the discovery
image (end figures 08s.45, 23".7), but the difference is quite small.
The offset is about 19" east and 2" south from the nucleus of the
lenticular galaxy IC 1861.  There are some field stars around this
galaxy, so the identification needs care.

  The morphology of the host suggest that SN 1999eg is likely of type
Ia.  Estimated from the recession velocity of this galaxy (6700 km/s),
the peak magnitude of this SN is around 16.5 mag or so.

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

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