POSSIBLE SUPERNOVA IN UGC 11404(=PGC 62781)
Zhijian Xu(Nanjing,Jiangsu,China) and Xing Gao (Urumqi,Xinjiang,China), report the discovery of a possible supernova (mag approximately 17.4) on a 40-s survey image (limiting mag about 18.5)taken by Xing Gao in Xingming ObservationSky Survey(C42) around Nov. 12.55094 UT. using an unfiltered CCD ( + Celestron C14 Schmidt-Cassegrain telescope D=350-mm @f/6.9 ). The new object approximately located at R.A. =19h 07m 00s.73 Decl.=+29°00’16”.6(equinox 2000.0). Which is about 34.5″ west and 6.5″ south of the center of the UGC 11404. Nothing is visible at this position on archival images taken on Nov. 9(limiting mag 19.0), Oct. 30(limiting mag 18.7) or on the DSS from Jun. 21,1987(limiting mag about 19.8).
XM54ZX C2012 11 12.55094 19 07 00.73 +29 00 16.6 17.2 V C42
All images can be seen from: http://www.xjltp.com/XOSS/XM54ZX/XM54ZX.htm
C42,Xingming Observatory,Mt. Nanshan. Observers Z.Xu,X.Gao,Measurers Z.Xu 0.36-m f/6.9 Schmidt-Cassegrain telescope and CCD.
Electronic Telegram No. 3300
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.
e-mail: email@example.com (alternate firstname.lastname@example.org)
Prepared using the Tamkin Foundation Computer Network
SUPERNOVA 2012gj IN UGC 11404 = PSN J19070073+2900166
Zhijian Xu (Nanjing, Jiangsu, China) and Xing Gao (Urumqi, Xinjiang,
China) report the discovery of an apparent supernova (mag approximately 17.4)
on an unfiltered 40-s CCD survey image (limiting mag about 18.5) taken by
Xing Gao in the course of the Xingming Observation Sky Survey at Mt. Nanshan
around Nov. 12.551 UT using a 36-cm Celestron C14 Schmidt-Cassegrain telescope.
The new object is approximately located at R.A. = 19h07m00s.73, Decl. =
+29d00’16”.6 (equinox 2000.0), which is about 34″.5 west and 6″.5 south of the
center of UGC 11404. Nothing is visible at this position on a Digitized Sky
Survey image from 1987 June 21 (limiting mag about 19.8; no bandpass
specified). The discovery images are posted at the following website URL:
http://www.xjltp.com/XOSS/XM54ZX/XM54ZX.htm. The variable was designated PSN
J19070073+2900166 when it was posted at the Central Bureau’s TOCP webpage
and is here designated SN 2012gj based on the spectroscopic confirmation
reported below. Additional CCD magnitudes for 2012gj: Oct. 30, [18.7 (Gao);
Nov. 9, [19.0 (Gao); 13.058, 16.9 (R. A. Koff, Bennett, CO, USA; Meade 0.25-m
f/10 reflector + Apogee U-47 camera; limiting magnitude 19.0; position end
figures 00s.66, 16″.9; UCAC3 reference stars); 13.136, 17.7 (J. Brimacombe,
Cairns, Australia; luminance filter; position end figures 00s.68, 17″.2;
image posted at URL http://www.flickr.com/photos/43846774@N02/8187102022/);
14.535, 16.9 (Xu and Gao; position end figures 00s.70, 17″.2).
S. Zaggia, L. Tomasella, S. Benetti, and A. Pastorello, Osservatorio
Astronomico di Padova, Istituto Nazionale di Astrofisica, report that optical
spectroscopy (range 450-820 nm; resolution 1.3 nm) obtained on Nov. 15.77 UT
with the Asiago 1.82-m Copernico Telescope (+ AFOSC) shows that PSN
J19070073+2900166 = SN 2012gj is a type-II supernova at redshift, z, around
0.013 (Haynes and Giovanelli 1997, A.J. 113, 1197; via NED database). A good
match is found with several type-II supernovae about 10 days after the core
collapse. An ejecta expansion velocity of about 14000-15000 km/s is derived
from the minimum of the very broad, P-Cyg profile H-alpha line. Together with
the Balmer lines, Fe II features are also detected. The Asiago classification
spectra are posted at website URL http://graspa.oapd.inaf.it; classification
was made via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383) and SNID
(Blondin and Tonry 2007, Ap.J. 666, 1024).
NOTE: These ‘Central Bureau Electronic Telegrams’ are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2012 CBAT
2012 November 16 (CBET 3300) Daniel W. E. Green