[IAUC] CBET 2426: 20100826 : NEW VARIABLE STAR IN CYGNUS

[quai en cfa.harvard.edu]

                                                  Electronic Telegram No. 2426
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Room 209; Dept. of Earth and Planetary
 Sciences; Harvard University; 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbat en iau.org; cbatiau en eps.harvard.edu
URL http://www.cfa.harvard.edu/iau/cbat.html


NEW VARIABLE STAR IN CYGNUS
     K. Itagaki, Yamagata, Japan, reports (via H. Yamaoka, Kyushu University)
his discovery of a new variable star during his CCD survey using a 0.21-m
reflector on Aug. 23.745 UT.  A confirming image taken with a 0.60-m reflector
on Aug. 23.778 (when its unfiltered magnitude was about 13.8) yields the
position as R.A. = 20h51m26s.19, Decl. = +44d05'23".6 (equinox 2000.0).  No
object was detected at this position on a survey reference image taken on 2008
Aug. 7.668 (limiting mag about 17.5), but it has gradually brightened in 2010.
Other available unfiltered CCD magnitudes for the variable: 2009 Dec. 19.450,
[16.5 (observed at Tochigi station); 2010 Feb. 20.798, 15.6 (at Tochigi); Apr.
3,768, 15.1; May 8.720, 14.9; June 2.619, 14.7.  The outbursting FU Ori-type
star HBC 722 (e.g., see http://www.astronomerstelegram.org/?read=2808) is also
detected on Itagaki's recent survey image.  Yamaoka notes that a very faint
(mag about 20) object can be seen on the Digitized Sky Survey (DSS) F plate
taken on 1990 Sept. 11, but cannot on other DSS images including an N plate
from 1994 Sept. 12.  Yamaoka also notes that the new object is a bright source
in the mid-infrared region (IRAS and AKARI) but was not detected in the
near-infrared region (such as 2MASS), and it is embedded in a massive star-
forming region.  Also, nearby V1704 Cyg is at mag about 16.5 on Aug. 23 on
Itagaki's image, which has been posted at http://www.k-itagaki.jp/images/p.jpg
with the new variable marked.


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                         (C) Copyright 2010 CBAT
2010 August 26                   (CBET 2426)              Daniel W. E. Green