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THE ASTRONOMER Electronic Circular No 2891      2013 Feb 03 14.37UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074
INTERNET: GUY@TAHQ.DEMON.CO.UK      Backup: gmh@wdcc1.bnsc.rl.ac.uk
WORLD WIDE WEB                         http://www.theastronomer.org
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NOVA CEPHEI 2013
Koichi Nishiyama and Fujio Kabashima, Japan, report on CBET 3397 their 
discovery of a possible magnitude 10.3 nova on unfiltered CCD frames 
(limiting magnitude 13.5) of 2013 Feb. 2.412UT using a 105-mm f/4 camera 
lens (+ SBIG STL6303E camera).  They confirmed the presence of the 
object on unfiltered CCD frames (limiting magnitude 17.5) of 2013 Feb 
2.43 using a Meade 200R 0.40-m f/9.8 reflector (+ SBIG STL1001E camera). 
The object is located at:
RA 23h 08m 04.71s DEC +60 46' 52.1" (2000).
Their survey frames of Jan 23.41 and 26.41 do not show the object to a 
limit of magnitude 13.6.

Additional CCD magnitudes for the variable:
Jan. 28.41, 11.9 (Nishiyama and Kabashima; pre-discovery); 28.46, [13.0 
(Hiroyuki Maehara, images of the Kyoto/Kiso Wide-field Survey); 30.39, V 
= 11.97 (Maehara; pre-discovery); 30.413, 11.0 (Nishiyama and Kabashima; 
pre-discovery; 31.389, V = 11.45 (Maehara; pre-discovery); Feb. 2.536, V 
= 11.64, R_c = 10.96 (Seiichiro Kiyota, remotely with a 0.50-m f/6.8 
astrograph + FLI ProLine PL11002M camera of iTelescope.NET near Mayhill, 
USA; 2.568, V = 11.64 (Katsumi Yoshimoto, Japan; limiting mag 13.7; 
Nikon D5000 Digital camera + Nikon 180-mm f/2.8 lens; image posted at 
website URL 
http://orange.zero.jp/k-yoshimoto/PNV%20J23080471+6046521.jpg)

Ernesto Guido e-mailed TAHQ to report confirmation of the optical 
counterpart on Feb 2.8 at unfiltered magnitude 9.8 and measured a 
position as:
RA 23h 08m 04.70s DEC +60 46'52.0" (2000)
using a 0.43-m f6.8 reflector remotely at Nerpio, Spain.

Nick James, Chelmsford, England, also e-mailed that he recorded it on 
Feb 2.86UT. Using TYC 4278-1000-1 as a reference (which has derived 
V=10.86, Rc=10.62, Ic=10.40) he obtained the following for the presumed 
nova: 2013-02-02.8 V=11.42, Rc=10.31, Ic=9.09.

Kazuyoshi Imamura, Okayama University of Science (OUS), advises that his 
team obtained a low-resolution spectrogram on Feb. 2.526 UT using the 
DSS-7 spectrometer attached to the 0.40-m Schmidt-Cassegrain telescope 
at the OUS observatory. Emission lines of Balmer series (FWHM of H-alpha 
about 1000 km/s), Fe II (74), and O I (777.3 nm) can be seen in the 
spectrum.  H-alpha and O I lines show clearly a P-Cyg profile.  The 
expansion velocity derived from these profiles is approximately 1200 
km/s.  From this result, the variable is thought to be a classical nova 
of the "Fe II" class.  The spectrum has been posted at website URL 
http://tnblab.blog7.fc2.com/blog-entry-361.html.

Editor: The last and only confirmed nova in Cepheus was found back on 
1971 July 10 by Y. Kuwano.

Guy M Hurst