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THE ASTRONOMER Electronic Circular No 2768      2011 Sep 29 19.05UT
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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CATACLYSMIC VARIABLE STAR IN DRACO
Hideo Nishimura, Japan reports on CBET 2818 the discovery of an eruptive 
object of mag 11.8 on two 10-s CCD frames (limiting magnitude 14.0) 
taken on 2011 Sept. 5.529 UT with a Canon EOS 5D digital camera (+ Canon 
200-mm f/3.2 lens) at Mt. Kogasayama, Kakegawa.  The variable, initially 
designated PNV J18422792+4837425 is located at RA 18h 42m 27.92s DEC +48 
37' 42.5" (2000); Nakano measured position end figures 28s.11, 41".5 
(+/- 2") for the variable and limiting mag 15.6 from Nishimura's 
confirming frame taken on Sept. 5.695 with the same instrument. 
Additional magnitudes: 2011 Aug. 11, [13.5 (Nishimura); 24, [13.5
(Nishimura); Sept. 7.450, 12.4 (T. Noguchi, Katori, Chiba-ken, Japan; 
0.23-m Schmidt- Cassegrain reflector + unfiltered BITRAN BT-11E CCD 
camera; position end figures 28s.01, 41".5; via Nakano). Toru Yusa, 
Osaki, Japan, has posted an image at:
http://space.geocities.jp/yusastar77/PNV_110906.htm.

U. Munari, Padova Astronomical Observatory, reports that he acquired a 
spectrogram of this object, which is visible where the Palomar Sky 
Survey images show an empty field. The spectrogram (resolution 0.23 
nm/pixel; range 320-780 nm) was taken on Sept. 6.841 UT with the 1.22-m 
telescope of the Asiago Astrophysical Observatory.  The spectrum is 
dominated by an absorption continuum similar to that of an A-type star 
-- with H_alpha in emission, filling in the corresponding absorption, 
and H_beta appearing as an emission core within the absorption profile. 
The H_alpha and H_beta emission lines are very sharp (gaussian-like), 
not wider than the instrumental profile.  Overall, the spectrum is very 
typical of a cataclysmic variable close to maximum brightness.

Guy M Hurst