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SN 2011fu in ugc1626 - 21 settembre 2011

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SN 2011fu (A.R. 02 08 21.41, Dec. +41 29 12.3) scoperta il 21 settembre 2011 nella galassia UGC 1626 (offset 2W 26N), magnitudine 15.8, tipo II.

SN scoperta da F. Ciabattari ed E. Mazzoni con il telescopio Newton da 50cm dell'Osservatorio di Monte Agliale (Lucca).

UGC 1626 è una galassia SAB distante 78 Mpc, magnitudine 14.1.

                                                  Electronic Telegram No. 2827
Central Bureau for Astronomical Telegrams
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
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SUPERNOVA 2011fu IN UGC 1626 = PSN J02082141+4129123
     F. Ciabattari and E. Mazzoni, Borgo a Mozzano, Italy, report the discovery
of a possible supernova (mag 15.8) on unfiltered CCD images (limiting mag 18.5)
obtained on Sept. 21.04 and 21.85 UT with a 0.5-m Newtonian telescope in the
course of the Italian Supernovae Search Project.  The new object is located at
R.A. = 2h08m21s.41, Decl. = +41d29'12".3 (equinox 2000.0; astrometry with
respect to UCAC-2 stars), which is 2" west and 26" north of the center of the
galaxy UGC 1626.  Nothing is visible at this position on digitized plates of
the Palomar Sky Survey from 1987 Oct. 19 (F plate; limiting magnitude 20.3)
and 1989 Sept. 8 (J plate; limiting magnitude 20.3).  This object received the
designation PSN J02082141+4129123 when it was posted at the Central Bureau's
TOCP webpage and is here designated SN 2011fu based on the spectroscopy
reported below.  Additional unfiltered CCD magnitudes for 2011fu:  Aug. 10,
[18.8 (Ciabattari and Mazzoni); Sept. 20.708, 16.1 (Z. Jin and X. Gao, Mt.
Nanshan, China, 0.35-m f/6.9 Schmidt-Cassegrain telescope; position end
figures 21s.25, 09".7; pre-discovery); 21.862, 16.2 (Nick James, Chelmsford,
Essex, England; position end figures 21s.26, 09".8); 22.235, 15.9 (Joseph
Brimacombe, Cairns, Australia; position end figures 21s.22, 10".0; image
posted at URL http://www.flickr.com/photos/43846774@N02/6171405979/).

     L. Tomasella, S. Valenti, P. Ochner, S. Benetti, and E. Cappellaro,
Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica; and A.
Pastorello, Dipartimento di Astronomia, Universita di Padova, on behalf of a
larger collaboration, report that a spectrogram (range 360-810 nm; resolution
2.2 nm) of PSN J02082141+4129123 = SN 2011fu, obtained on Sept. 23.84 UT with
the Ekar-Copernico 1.82-m telescope (+ AFOSC), shows it to be a young type-II
supernova, a few days after explosion.  The spectrum shows a blue continuum
with superimposed weak H and He I 587.6-nm lines.

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

                         (C) Copyright 2011 CBAT
2011 September 25                (CBET 2827)              Daniel W. E. Green