SN 2014cg (A.R., 20 04 34.85 Dec. +12 44 16.8), scoperta il 18 july 2014 nella galassia UGC 11512 (offset 4E 7S), magnitudine 17.8, tipo: Ia
SN individuata da F. Ciabattari, E. Mazzoni and G. Petroni con il telescopio Newton da 50cm dell'Osservatorio di Monte Agliale (Lucca).
Electronic Telegram No.
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.
Prepared using the Tamkin Foundation Computer Network
SUPERNOVA 2014cg IN UGC 11512 = PSN J20043485+1244168
F. Ciabattari, E. Mazzoni, and G. Petroni, Borgo a Mozzano, Italy,
their discovery of an apparent supernova (mag 17.8) on unfiltered CCD images
(limiting magnitude 19.5) obtained on July 18.95 and 19.92 UT with a 0.5-m
Newtonian telescope (+ FLI 4710 Proline camera). The new object is located
R.A. = 20h04m34s.85, Decl. = +12d44'16".8 (equinox 2000.0; astrometry with
respect to UCAC-2 stars), which is 4" east and 7" south of the center of
galaxy UGC 11512. Nothing is visible at this position on the digitized
of the Palomar Sky Survey from 1992 July 27 (J plate; limiting mag 20.3) and
1992 Sept. 27 (F plate; limiting mag 20.3). The variable was designated PSN
J20043485+1244168 when it was posted at the Central Bureau's TOCP webpage
is here designated SN 2014cg based on the spectroscopic confirmation
below. Additional CCD magnitudes for 2014cg: 2014 July 4, [19.5
et al.); 22.344, 18.3 (J. Brimacombe, Cairns, Australia; remotely using a
51-cm RCOS telescope + + luminance filter at the New Mexico Skies
near Mayhill, NM, U.S.A.; position end figures 34s.83, 17".5; image posted
website URL https://www.flickr.com/photos/43846774@N02/14543018109/);
18.2 (G. Masi; remotely using a 43-cm telescope at Ceccano, Italy; position
end figures 34s.84, 16".2).
J. Zhang, Yunnan Observatories (YNAO); and X.-f. Wang, Tsinghua
University, report on an optical spectrogram (range 330-890 nm) of 2014cg
was obtained on 2014 July 24.68 UT with the 2.4-m telescope (+ YFOSC) at the
LiJiang Gaomeigu Station of YNAO. The spectrum shows that PSN
J20043485+1244168 = SN 2014cg is a type-Ia supernova a few days after
light. Cross-correlation with a library of supernova spectra using the
"Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666,
1024) shows that 2014cg matches with SN 2005cg at +7 days. Adopting a
redshift of 0.0147 for the host galaxy, UGC 11512 (Huchra et al. 1999, Ap.J.
Suppl. 121, 287), they measure a velocity of the Si II 635.5-nm absorption
feature to be about 10300 km/s. The continuum of the spectrum is very red,
suggesting that this supernova may suffer significant reddening from the
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2014 CBAT
2014 August 28 (CBET 3945) Daniel W. E. Green