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(IAAC) SN 1998aq (possibly bright new supernova)



>Date: Wed, 15 Apr 1998 12:53:58 +0900 (JST)
>From: Yamaoka Hitoshi <yamaoka@rc.kyushu-u.ac.jp>
>To: vsnet-alert@kusastro.kyoto-u.ac.jp, isn_chat@mbox.queen.it
>Subject: SN 1998aq
>Cc: yamaoka@rcsvr.rc.kyushu-u.ac.jp
>
>Dear SN fans,
>
>  Another SN was discovered by English amateur astronomer M.
>Armstrong. This SN is very remarkable!
>
>  According to IAUC 6875, discovery was made on Apr 13.05UT when SN
>was 14.9 mag. The host galaxy is Sbc galaxy NGC 3982. The location of
>the new star is R.A. = 11h56m26s.00, Decl. = +55o07'38".8 (2000.0),
>which is 18" west and 7" north of the center of the host. Type
>definition has not been reported yet.  On Apr. 13.8 exposure, this new
>star was about 14.5 mag, which indicates that this SN should be on the
>brightening phase (very early phase).
>
>  The distance module of the host galaxy NGC 3982 is m-M = 31.15
>(from Turry's nearby galaxy catalog), which shows that this galaxy is
>on the same distance with Virgo cluster.  NGC 3982 = UGC 6918 = IRAS
>11538+5524 = PGC 37520 is Seyfert 2 galaxy, and also detected by
>ROSAT.  Typical SNeIa on Virgo distance would be about 12 mag or so at
>their maximum (without reddening), and a some (~2mag) dimmer if it is
>of other types.  Following photometries and spectroscopic observations
>are strongly urged.  Especially it can provide the nature of SN on
>very early phase.
>
>Sincerely Yours,
>Hitoshi Yamaoka, Kyushu Univ., Japan
>yamaoka@rc.kyushu-u.ac.jp
>