Thu, 1 Aug 2002
(This is number 4!!)
Dear SN watchers,
Berto Monard discovered another SN than SN 2002cy. The host galaxy NGC 5468 also produced SN Ia 2002cr [vsnet-campaign-sn 418].
New SN is discovered on July 27.77 UT when it was mag about 16.5. It was confirmed on July 28.70 UT with mag about 16.4. The position of SN 2002ed is reported as R.A. = 14h06m38s.2, Decl. = -5o27'29" (2000.0), which is 55" east and 15" south of the center of a face-on spiral (SAB(rs)cd) galaxy NGC 5468. It was also detected on the KAIT images taken on July 24-29, but was not seen on July 23 image (limiting mag 17.5) taken by Berto.
SN 2002cr was discovered this May in the same galaxy. It was of type Ia, and reached its maximum (mag about 14.2) around May 13. It can still be seen at mag about 17.8, so you can enjoy "double explosion" for a while. The discovery image can be seen at:
ftp://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/SNe/sn2002ed/
NGC 5468 also produced SN Ia 1999cp. So this galaxy is quite prolific. Such examples that 3 SNe in 3 calendar years are:
NGC 664 Sb: SNe 1996bw, 1997W, 1999eb
NGC 6754 SAB(rs)bc SNe 1998X, 1998dq, 2000do
All of them including NGC 5468 are open spiral galaxies, which is active in star formation.
Sincerely Yours,
Hitoshi Yamaoka, Kyushu Univ., Japan
yamaoka@rc.kyushu-u.ac.jp
Submitted by: Brian Fraser