SN 2011fx (A.R. 00 17 59.56, Dec. +24 33 46.0) scoperta il 30 agosto 2011 nella galassia PGC 1170 (offset 3W 0S), magnitudine 17.6, tipo IIn.
SN scoperta da F. Ciabattari ed E. Mazzoni con il telescopio Newton da 50cm dell'Osservatorio di Monte Agliale (Lucca).
PGC 1170 è una galassia a spirale distante 84.7 Mpc, magnitudine 14.7.
Electronic Telegram No. 2830
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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 2011fx IN PGC 1170 = PSN J00175956+2433460
F. Ciabattari and E. Mazzoni, Borgo a Mozzano, Italy, report the discovery
of a possible supernova (mag 17.6) on unfiltered CCD images (limiting mag 18.8)
obtained on Aug. 30.05 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. =
00h17m59s.56, Decl. = +24d33'46".0 (equinox 2000.0; astrometry with respect to
UCAC-2 stars), which is 3" west of the center of the galaxy PGC 1170. Nothing
is visible at this position on digitized plates of the Palomar Sky Survey from
1952 Aug. 22 (F plate; limiting magnitude 20.3) and 1993 Sept. 15 (J plate;
limiting magnitude 20.3). The variable was designated PSN J00175956+2433460
when it was posted at the Central Bureau's TOCP webpage and is here designated
SN 2011fx based on the spectroscopic report below. Additional unfiltered CCD
magnitudes for 2011fx: Aug. 30.94, 17.5 (Ciabattari and Mazzoni; limiting mag
19.4); 31.18, 17.5 (R. A. Koff, Bennett, CO, U.S.A.; Meade 0.25-m f/10
Schmidt-Cassegrain reflector; position end figures 59s.52, 45".4; image at URL
http://antelopehillsobservatory.org/SNpictures/PSNJ00175956+2433460final.jpg);
Sept. 3.236, 16.6 (J. Brimacombe, Cairns, Australia; position end figures
59s.50, 45".5). Brimacombe's image is posted at the following website URL:
http://www.flickr.com/photos/43846774@N02/6108140961/.
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 J00175956+2433460 = SN 2011fx, obtained on Sept. 23.91 UT,
shows a blue continuum with narrow (FWHM about 2200 km/s) H lines in emission,
typical of a young type-IIn supernova.