[IAUC] CBET 2376: 20100719 : SUPERNOVA 2010gi IN IC 4660

[quai en cfa.harvard.edu]

                                                  Electronic Telegram No. 2376
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Room 209; Dept. of Earth and Planetary
 Sciences; Harvard University; 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbat en iau.org; cbatiau en eps.harvard.edu
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVA 2010gi IN IC 4660
     S. Nakano, Sumoto, Japan, reports the discovery by Masaki Tsuboi
(Kuchita-minami, Asakita-ku, Hiroshima) of an apparent supernova (mag 15.3)
on unfiltered CCD frames (limiting mag 18.2) taken on July 18.514 UT using a
0.30-m f/5.3 reflector (+ ST-2000XM camera); the new object was measured by
Tsuboi to be located at R.A. = 17h21m46s.1, Decl. = +75d50'45".4 (equinox
2000.0), which is 3".2 east and 10".6 south of the center of IC 4660.
Nothing is visible at this position on Tsuboi's past frames taken on May 13
and 30 UT or on a red Digitized Sky Survey photograph.  Nakano measures mag
14.9 and position end figures 46s.0, 44".3 (offset 1".8 east, 6".4 south of
the center of IC 4660) from an image (limiting magnitude 17.8) taken by
Tsuboi on July 18.658.
     After posting on the Central Bureau's unconfirmed-objects webpage,
Toru Yusa (Osaki, Japan) reports that he confirmed 2010gi at mag 15.0 on
two 120-s unfiltered CCD exposures (limiting mag 18.0) taken on July 19.153
UT remotely using a 0.25-m f/3.4 reflector (+ SBIG ST-10XME camera) at the
RAS Observatory near Mayhill, NM, U.S.A., yielding position end figures
46s.06, 44".5 (USNO-B1.0 catalogue) and offset 2".9 east, 9".8 south; he has
posted his image at http://space.geocities.jp/yusastar/PSNinIC4660_100719.htm.
Also, D. D. Balam, Dominion Astrophysical Observatory, writes that imaging
using the 1.82-m Plaskett telescope of the National Research Council of
Canada shows the new source to be at magnitude R = 15.8 on July 19.23 with
offset 3".7 east, 9".4 south of the core of IC 4660.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2010 CBAT
2010 July 19                     (CBET 2376)              Daniel W. E. Green