Electronic Telegram No. 4000
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 2014do IN ESO 431-G2 = PSN J08174339-3007211
     S. Parker, Canterbury, New Zealand, reports the discovery of an apparent
supernova (red mag 16.0) on a 30-s unfiltered CCD image (limiting mag 18.5)
taken by himself on Sept. 28.678 UT with an Officina Stellare 40-cm f/5.25
RiLA Astrograph (+ ST10 camera) at his Parkdale Observatory in the course of
the Backyard Observatory Supernova Search.  The new object is located at R.A.
= 8h17m47s.37, Decl. = -30d07'20".9 (equinox 2000.0; reference stars from
USNO-B and UCAC4 catalogues; corrected position from that first posted on the
TOCP), which is 52" east and 29" north (corrected) of the nucleus of the
galaxy ESO 431-G2.  Nothing is visible at this position on Digitized Sky
Survey red and infrared images (limiting red mag > 19).  An image of the new
object is viewable at website URL http://tinyurl.com/pmth96e.  The variable
was designated PSN J08174339-3007211 when it was posted at the Central
Bureau's TOCP webpage and is here designated SN 2014do based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2014do:  Sept. 30.361, 16 (J. Maza, Universidad de Chile; position end
figures 47s.38, 21".2); Oct. 2.783, 16.9 (J. Brimacombe, Cairns, Australia;
remotely using a 33-cm RCOS telescope at the Savannah Skies Observatory, in
northern Queensland, Australia; position end figures 47s.38, 21".0; images
posted at URL https://www.flickr.com/photos/43846774@N02/15440458801/); 3.78,
16.9 (Brimacombe; position end figures 47s.38, 21".1); 4.769, 16.9
(Brimacombe; position end figures 47s.39, 21".1).

     M. Childress, R. Scalzo, F. Yuan, B. Zhang, A. Ruiter, I. Seitenzahl, and
B. Schmidt, Australian National University (ANU); and B. Tucker, ANU and
University of California at Berkeley, report that spectroscopic classification
of PSN J08174339-3007211 = SN 2014do was obtained via a 40-min exposure on
Oct. 3.74 UT with the Wide Field Spectrograph (cf. Dopita et al. 2007, Ap.
Space Sci. 310, 255) on the ANU 2.3-m telescope at Siding Spring using the
B3000/R3000 gratings (wavelength range 350-980 nm at 0.1-nm resolution).  The
spectrum indicates that 2014do is a type-II supernova a couple weeks past
maximum light, with clear signatures of hydrogen.  Classification with SNID
(Blondin and Tonry, 2007, Ap.J. 666, 1024) shows a good match to SN 2005cs at
phase +13 days, and the preferred SNID redshift is about 0.004, consistent
with the apparent host galaxy, ESO 431-G2 (z = 0.00552; Kraan-Korteweg and
Huchtmeier 1992, A.Ap. 266, 150).


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2014 CBAT
2014 October 18                  (CBET 4000)              Daniel W. E. Green