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S.N





http://www.aavso.org/aavso-special-notice-241
Spectre fait par C. BUIL : http://astrosurf.com/buil/supernovae/2011/_sn2011dh.png

ATEL #3398 ATEL #3398 
Title: PTF Discovery of a Type II Supernova in M51
Author: J. M. Silverman, A. V. Filippenko, S. B. Cenko (UC Berkeley)
report on behalf of a larger collaboration:
Queries: cenko@astro.berkeley.edu
Posted: 3 Jun 2011; 09:15 UT
Subjects:Optical, Supernovae
The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf/; Law et al.
2009, PASP, 121, 1395; Rau et al. 2009, PASP, 121, 1334) reports the discovery
of a new supernova in M51. This object was independently discovered first
 by A. Riou and reported as PSN J13303600+4706330. PTF discoveries are
 made by autonomous PTF software, as well as by the Galaxy Zoo Supernova
Project (Smith et al. 2011, MNRAS, 412, 1309; http://supernova.galaxyzoo.org
Name | RA (J2000) | Dec (J2000) | Discovery | Mag | Redshift | Type 
| Spec. | Phase | Instrument | Notes
PTF11eon | 13 30 05.08 | +47 10 11.2 | Jun 01.19 | 13.5 | 0.002 | SN
II
| Jun. 2 | | Keck I+ LRIS | exact magnitude uncertain due to
saturation
The spectrum shows a relatively blue continuum, with well-developed P-Cygni
profiles in the Balmer series. After removal of the host-galaxy recession
velocity of 600 km/s (Rush, et al. 1996, ApJ, 473, 130), the minimum of
the H-alpha absorption is blueshifted by about 17,600 km/s.
PTF is a collaboration of Caltech, LCOGT, the Weizmann Institute, LBNL,
Oxford, Columbia, IPAC, and Berkeley.

lectronic Telegram No. 2710
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 2011ca IN NGC 4495 = PSN J12312490+2907500
F. Ciabattari and E. Mazzoni, Borgo a Mozzano Italy, report the discovery
of an apparent supernova on unfiltered CCD images (limiting mag about 19)
obtained on Apr. 26.94 (when the object was at mag 17.2) and 27.88 UT (at mag
17.1) with a 0.5-m reflector. The new object (which was designated PSN
J12312490+2907500 when posted on the Central Bureau's TOCP webpage and is
here designated SN 2011ca based on the spectroscopic report below) is located
at R.A. = 12h31m24s.94, Decl. = +29d07'50".6 (equinox 2000.0; astrometry with
respect to UCAC2 stars), which is 24" east and 20" south of the center of the
galaxy NGC 4495. Additional magnitudes for 2011ca (via unfiltered CCD unless
otherwise noted, and via Ciabattari and Mazzoni unless otherwise noted):
1990 Jan. 29, [20.3 (Digitized Sky Survey; Palomar F plate); 1990 Mar. 23,
[20.3 (DSS; Palomar J plate); 2011 Apr. 5, [19.1; 28.190, 16.8 (Joseph
Brimacombe, Cairns, Australia; remotely using a 51-cm RCOS telescope + STL11K
camera at the New Mexico Skies Observatory, Mayhill, NM, U.S.A.; position
end figures 25s.00, 50".9). Brimacombe's image is posted at website URL
http://www.flickr.com/photos/43846774@N02/5668046246/. Supernovae 1994S and
2010lo also appeared in NGC 4495.

G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA), on
behalf of the CfA Supernova Group, reports that a spectrum (range 340-740 nm)
of PSN J12312490+2907500 = SN 2011ca was obtained on Apr. 30 UT by P. Berlind
with the F. L. Whipple Observatory 1.5-m telescope (+ FAST). Cross-
correlation with a library of supernova spectra using the "Supernova
Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows
that the object is a type-Ic supernova about one week after maximum light.


Image de comparaison, faite le 20100927, 5X120s, sans filtre, Lune présente et cirrus. ST7XMEd, T 254/900
; Refoc






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