[IAUC] CBET 834: 20070205 : POSSIBLE NOVA IN SCORPIUS

[IAUC mailing list]

                                                  Electronic Telegram No. 834
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS en CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT en CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html


POSSIBLE NOVA IN SCORPIUS
     Reports of apparently independent discoveries of a variable star in
Scorpius have been received by the Central Bureau.  H. Yamaoka, Kyushu
University, reports the discovery of a new object (mag 9.9) by Yuji
Nakamura (Kameyama, Mie, Japan) on two unfiltered CCD images taken on Feb.
4.8624 UT with a 135-mm camera lens, with the position of the variable
measured to be R.A. = 16h57m41s.0, Decl. = -32d20'34" (equinox 2000.0,
uncertainty about 30"); nothing was detected at this position with the same
equipment on Feb. 2.8662 (limiting mag 11.0) or Jan. 29.8669 (limiting mag
12.0).  S. Nakano, Sumoto, Japan, reports the discovery by Yukio Sakurai
(Mito, Ibaraki-ken) of the same star at mag 9.4 on two 10-s CCD exposures
taken on Feb. 4.896 using a Fuji FinePix S2 Digital Camera (+ Nikon 180-mm
f/2.8 lens), the position measured to be R.A. = 16h57m40s.91, Decl. =
-32d20'36".4; nothing is visible on a CCD frame taken by Sakurai on Feb.
2.8.  Nakano adds that he has measured the variable's position from one of
Sakurai's images, yielding position end figures 41s.24, 36".5.  Nakano
also writes that K. Kadota has confirmed the variable at mag 8.9 on an
unfiltered CCD image taken on Feb. 5.818 with a 0.25-cm f/5 reflector,
providing position end figures 41s.20, 35".8.  Kadota adds that the closest
stars in the USNO-A2.0 catalogue have the following position end figures:
40s.39, 39".5 (red mag 17.4, blue mag 18.6); 40s.93, 44".5 (red mag 15.6,
blue mag 17.3).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2007 CBAT
2007 February 5                  (CBET 834)               Daniel W. E. Green