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AAVSO Special Notice #207

Possible Nova in Scorpius - N Sco 2010 No. 2
April 26, 2010

Possible Nova in Scorpius - N Sco 2010 No. 2
April 26, 2010

Central Bureau for Astronomical Telegrams CBET 2262 (Daniel W. E. Green, 
ed.) announces the discovery by Koichi Nishiyama, Kurume, Fukuoka-ken, 
Japan; and Fujio Kabashima, Miyaki-cho, Saga-ken, Japan, of a possible 
nova in Scorpius at magnitude 8.6 on two 40-s unfiltered CCD frames 
(limiting magnitude 13.1) taken around April 25.788 UT. They confirmed 
the new object on unfiltered CCD frames (limiting magnitude 17.3) taken 
around April 25.796 from which they measured the following precise position:  

R.A. = 16:55:13.16, Decl. = -38:03:46.9 (equinox 2000.0)  

Nothing was visible on survey frames taken on April 23.786 down to 
12.9 and 24.757 down to 13.2, or on a Digitized Sky Survey plate 
from 1995 June 4 down to red magnitude 18.0.

S. Nakano, Sumoto, Japan, subsequently forwarded two independent 
discoveries to the CBAT: Hideo Nishimura, Miyawaki, Kakegawa, 
Shizuoka-ken, Japan, on CCD images from Apr. 25.763 UT at magnitude 
8.3 and position end figures 12.96s, 48.1"; and Tadashi Kojima, 
Tsumagoi, Agatsuma-gun, Gunma-ken, Japan, on CCD images from 
Apr. 25.738 UT at magnitude 8.8 and position end figures 13.46s, 
44.7" +/- 5".

Finder charts for N Sco 2010 No. 2 may be plotted by entering the
coordinates above into VSP: http://www.aavso.org/observing/charts/vsp/

Please report observations to the AAVSO International Database as
N Sco 2010 No. 2 or VSX J165513.1-380346; N Sco 2010 No. 2
is preferred.  Once an AUID is assigned, observations will be uploadable
to the AAVSO - if you try and your observations are rejected, it is 
likely because the AUID has not yet been assigned. You may check the status
at VSX.

Good observing!

Elizabeth O. Waagen, Senior Technical Assistant


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