[vsnet-alert 1684] SN 1998an

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

Dear all,

  SN 1998an, which had apparently shown a great brightening (noted on
[vsnet-alert 1669] and isn_chat on Apr. 13), is now at a normal
brightness as it is SN Ia at the distance estimated from its recession
velocity.

  The compilation of reported magnitudes of SN 1998an:

Apr  6.871   15.3:  C   Arbour    IAUC6871 (discovery image)
Apr  8.792   15.6   V   Hanzl     IAUC6877
Apr 11.819   15.6   V   Hanzl     IAUC6877
Apr 11.880   14.6:  mv  Poyner    vsnet
Apr 13.815   15.7   V   Hanzl     IAUC6877
Apr 14.856   15.6   V   Hanzl     IAUC6877
Apr 15.140   15.4:  mv  King      vsnet (AAVSO SS Aur seq.)
Apr 15.883   15.5:  mv  Poyner    vsnet (GSC seq.)

  On Apr 15.5UT, Dr. Ayani, Bisei Astronomical Observatory, Japan, 
has obtained the spectrum of SN 1998an and it shows that this SN is 
of type Ia around maximum.  This result had submitted to IAUC.

Best wishes,
Hitoshi Yamaoka, Kyushu Univ., Japan
yamaoka@rc.kyushu-u.ac.jp

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