POSSIBLE SUPERNOVA IN UGC 11706(=PGC 66396)
Zhijian Xu(Nanjing,Jiangsu,China) and Xing Gao (Urumqi,Xinjiang,China), report the discovery of a possible supernova (mag approximately 16.6) on a 40-s survey image (limiting mag about 18.5) taken by Xing Gao in Xingming Observation Sky Survey(C42) around Dec.21.53473 UT.using an unfiltered CCD ( + Celestron C14 Schmidt-Cassegrain telescope D=350-mm @f/6.9 ). The new object approximately located at R.A.=21h 14m 22s.87 Decl.=+15°14’40”.7(equinox 2000.0), which is about 5.8″ east and 2″ north of the center of the UGC 11706. Nothing is visible at this position on archival images taken on Dec.09(limiting mag 18.7),Dec.10(limiting mag 19.0) or on the DSS from Aug.14,1991(limiting mag about 19.9).
NET USNO-A2.0
XM56ZX C2012 12 21.53473 21 14 22.87 +15 14 40.7 16.6 V C42
All images can be seen from: http://www.xjltp.com/XOSS/XM56ZX/XM56ZX.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. 3364
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: cbatiau@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network
SUPERNOVA 2012ig IN UGC 11706 = PSN J21142287+1514407
Zhijian Xu, Nanjing, Jiangsu, China; and Xing Gao, Urumqi, Xinjiang,
China, report the discovery of a possible supernova (mag approximately 16.6)
on an unfiltered 40-s survey CCD image (limiting mag about 18.5) taken at Mt.
Nanshan by Xing Gao in the course of the Xingming Observation Sky Survey
around Dec. 21.535 UT using a Celestron C14 Schmidt-Cassegrain telescope.
The new object is approximately located at R.A. = 21h14m22s.87, Decl. =
+15d14’40”.7 (equinox 2000.0), which is about 5″.8 east and 2″ north of the
center of UGC 11706 (= PGC 66396). Nothing is visible at this position on a
Digitized Sky Survey image from 1991 Aug. 14 (limiting mag about 19.9; no
bandpass or plate type specified). The discoverers have posted images at
website URL http://www.xjltp.com/XOSS/XM56ZX/XM56ZX.htm. The variable was
designated PSN J21142287+1514407 when it was posted at the Central Bureau’s
TOCP webpage and is here designated SN 2012ig based on the spectroscopic
confirmation reported below. Additional unfiltered CCD images for 2012ig:
Dec. 9, [18.7 (Xu and Gao); 10, [19.0 (Xu and Gao); 22.042, 16.2 (R. A. Koff,
Bennett, CO, USA; Meade 0.25-m f/10 reflector; limiting mag 19.4; position
end figures 22s.83, 40″.1; UCAC3 reference stars; image posted at website URL
http://antelopehillsobservatory.org/SNpictures/PSNJ21142287+1514407final.jpg).
P. Ochner, L. Tomasella, S. Benetti, E. Cappellaro, A. Pastorello, and M.
Turatto, Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica,
report that optical spectroscopy (range 340-800 nm; resolution 0.7 nm),
obtained on Dec. 28.69 UT with the Asiago 1.22-m Galileo Telescope (+ Boller &
Chivens spectrograph), shows that PSN J21142287+1514407 = SN 2012ig is a
type-Ia supernova. Adopting for the host galaxy (UGC 11706) the redshift z =
0.015798 (Bottinelli et al. 1993, A.Ap. Suppl. 102, 57; via NED), the best
fit is obtained with various type-Ia supernovae around maximum light. The
expansion velocity, as deduced from the position of the Si II 635.5-nm
absorption, is about 10300 km/s. 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 December 30 (CBET 3364) Daniel W. E. Green