[IAUC] CBET 890: 20070316 : POSSIBLE NOVA IN CYGNUS

[IAUC mailing list]

                                                  Electronic Telegram No. 890
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 CYGNUS
     S. Nakano, Sumoto, Japan, reports the discovery by Akihiko Tago
(Tsuyama, Okayama-ken) of a possible nova (mag 7.4) on three 30-s CCD
exposures taken around Mar. 15.787 UT with a Canon 20Da digital camera
(+ 70-mm f/3.2 lens; limiting magnitude 13.2 +/- 0.2), with Tago giving
the position of the variable as R.A. = 20h28m15s, Decl. = +41o49'.0
(equinox 2000.0), and noting that nothing was visible at this position
on his frame taken on Mar. 12.796 (limiting mag 12).  Tago adds that
an image taken by himself on Mar. 16.75 shows the variable at mag 7.5.
Nakano provides his own measure of the position end figures (estimated
uncertainty perhaps +/- 5" or more) from Tago's discovery image:
13s.22, 48'45".5, magnitude 6.8 +/- 0.4.  Nakano further adds that K.
Nishiyama and T. Sakamoto, Bisei Spaceguard Center, have confirmed the
variable star at mag 6.7 on an unfiltered CCD image taken with the
1.0-m f/3.0 reflector on Mar. 16.768, giving the object's position end
figures as 12s.52, 48'36".5.  A red USNO-catalogued star is located at
position end figures 12s.505, 48'36".69 (red mag 18.5).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2007 CBAT
2007 March 16                    (CBET 890)               Daniel W. E. Green