(IAAC) Supernova 2001ig in NGC7424 (Grus): in range of amateur scopes!
This SN is already in range of moderate-sized amateur scopes - and
if we are lucky, it may continue to brighten! The trick is to find
a Southern horizon dark and clear enough to spot this mag 11 barred
spiral, lying as it does in an East-stretching "wing" of the Crane,
nearly 12 degrees SOUTH of the "Fish's Mouth" star, Fomalhaut.
For the Equatorial and Southern Hemisphere observers on our "IAAC"
list, of course (and also observers in the American Southwest, and
especially Florida or Hawai'i) this could be a great target!
Clear skies and happy hunting,
------- Forwarded Message
Date: Fri, 14 Dec 2001 18:13:41 +0900 (JST)
From: Hitoshi YAMAOKA <email@example.com>
Subject: SN 2001ig in NGC 7424
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
Hitoshi Yamaoka, Kyushu Univ., Japan
------- End of Forwarded Message
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