[vsnet-alert 2617] SN 1999aa in NGC 2595

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

cf. vsnet-chart 136
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-chart/msg00136.html
cf. vsnet-chat 1641
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-chat/msg01641.html

Dear SN watchers,

  Mr. Ron Arbour, U.K. amateur astronomer, has discovered his third
supernova in NGC 2595 on Feb. 11.02.  Congratulations, Ron!

  According to IAUC 7108, the new star appears at R.A. = 8h27m42s.03,
Decl. = +21o29'14".8 (2000.0), which is about 30" north from the
bright core of the host galaxy NGC 2595.  The host is an SBc galaxy
nearly face-on, and SN 1999aa is just on the northern arm (ring?). 
(Images can be seen at Mr. Bishop's page:
http://vsnet.ggw.org/asras/snimages .)

  Reported magnitudes of SN 1999aa (from IAUC),
   1998 03        >17.5C  R. Arbour
   1999 02  5.3   >19C    KAIT
   1999 02 11.017  15.5C  R. Arbour,
which tells that it would be on the brightening phase.  

  The spectroscopy has performed at Lick Observatory, which tells that
this SN is peculiar one and resembles that of a peculiarly bright SN
Ia 1991T about a week before maximum.  

  From the recession velocity of the host (4400 km s-1, vsnet-chat
1641), the maximum of typical SNe Ia at this distance would be 15.5
mag or so, but 1991T was 0.5 -- 1 mag brighter than normal SNe Ia.
Further magnitude estimates are greatly encouraged, which will provide
a good tests for "brighter SN Ia has broader light curve" hypothesis.  

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

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