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[vsnet-alert 6928] Re: SN 2001ig in NGC 7424
- Date: Fri, 14 Dec 2001 11:53:07 +0200
- To: <yamaoka@rc.kyushu-u.ac.jp>, <vsnet-alert@kusastro.kyoto-u.ac.jp>, <vsnet-campaign-sn@kusastro.kyoto-u.ac.jp>, <astro-l@uwwvax.uww.edu>, <isnchat@yahoogroups.com>
- From: "Berto Monard" <LAGMonar@csir.co.za>
- Subject: [vsnet-alert 6928] Re: SN 2001ig in NGC 7424
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There is a foreground star about 90" SE of this SN. Its coordinates are
J225738.1-410342 and I derived a 'preliminary' magnitude of 14.8V for
it. I estimate (from U2 data) that this star is rather yellow.
Another foreground star of similar colour lies at J225711.3-410056 and
has an estimated 13.6V (UCAC1 and U2).
By lack of better, they could be used for approximate visual estimates
around the SN peak performance.
Regards,
Berto Monard
>>> Hitoshi YAMAOKA <yamaoka@rc.kyushu-u.ac.jp> 12/14/01 11:13AM >>>
Dear SN watchers,
R. Evans discovered a bright SN in the southern hemisphere (11.5
degrees south of Fomalhaut). It is quite young SN.
He discovered it visually on Dec. 10.43, and confirmed by C.
Bembrick with CCD on Dec. 10.55. The position of SN 2001ig is: R.A. =
22h57m30s.69, Decl. = -41o02'25".9 (2000.0), which is about 139" east
and 109" north of the big face-on open-spiral (SAB(rs)cd) galaxy NGC
7424. It locates on the end of the eastern spiral arm.
Because of the the neighbourhood (and apparent size) of the galaxy,
many, many star clusters or H II regions in NGC 7424 (or foreground
stars) can be seen on DSS 2 image. But the mag 14.2 object (V mag of
SN, on Dec. 13.0) would be clearly identified.
The spectrum taken at Las Campanas Observatory shows it is in the
very early phase; it shows very blue continuum with very broad and
largely blueshifted absorption features. The CfA team reports the
provisional classification as type II/IIb, but further spectroscopy is
needed to confirm. Note that the representative SN IIb 1993J in M 81
shows the "double peak" light curve. The intense followup photometry
is defenitely urged. Below is the reported magnitudes up to now.
SN2001ig 20011210.43 145: Evans
SN2001ig 20011210.55 151C Bembrick
SN2001ig 20011211.5 14.85C Bembrick
SN2001ig 20011212.1 14.26V CTIO
SN2001ig 20011212.1 14.21B CTIO
SN2001ig 20011213.0 14.24V CTIO
Sincerely Yours,
Hitoshi Yamaoka, Kyushu Univ., Japan
yamaoka@rc.kyushu-u.ac.jp
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