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THE ASTRONOMER Electronic Circular No 2146      2005 Aug 27 09.30UT
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             GMH at AST.STAR.RL.AC.UK
WORLD WIDE WEB                         http://www.theastronomer.org
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POSSIBLE VARIABLE NEAR PELICAN NEBULA
We have received a number of reports from members of the UK Astro 
imaging website and the SBIG CCD Users group including Peter Shah, James 
Foster and Duncan Miller regarding a star on the edge of the Pelican 
Nebula in Cygnus which may show variation.

Tom Boles, Coddenham, England kindly confirmed the object's presence on 
an unfiltered image of 2005 Aug 21.97598UT at magnitude 14.8 and 
obtained the following precise position:

RA 20h 49m 25.00s DEC +44 33' 49.1" (2000)

John Fletcher, Mount Tuffley Observatory, England also imaged the object 
with a 0.25-m Schmidt-Cassegrain telescope and CCD on Aug 25.89487 at 
15.9V and had end figures:
RA 25.05s DEC 49.0"

The object is shown on the digitised Quick V survey image of 1983.677 
but very near the limit and considerably fainter than in the unfiltered 
image by Tom. On POSS II the blue image (1993) does not definitely show 
the object at all but on the red (1990) it is clearly seen but faint.

John has also proposed the following candidate from the USNO B1.0 
catalogue: USNO 1345-0396670. The precise position from this source is:
RA 20h 49m 24.9873s DEC +44 33' 49.450" (2000)
Magnitudes given are: R1 = 16.83; R2 = 18.11; I2-13.25 and we are 
indebted to Mark Kidger for this research.

In addition there is a Carbon star, CGCS 4993 listed on Simbad at:
RA 20h 49m 24.1s DEC +44 33' 43" and thus about 6 arc seconds away. 
Presumably this object is very red which differs from an image we have 
received from Peter Shah where a very blue object is depicted.
Peter adds that his image was taken with a 0.20-m Newtonian F/4.5, and a 
hx916 Starlight Xpress CCD, from Meifod, Powys, on 2005 August 6 using 
sulphur2 =red, H-alpha=green and Oxygen 3 for the blue exposures which 
were 3x10mins subs for each filter, giving a total exposure time of 
90mins. It is possible that this combination may have enhanced the 
blueness of the object and other colour images would be welcomed.

VARIABLE OBJECT NEAR MESSIER 27
Tonny Vanmunster, Belgium, reports that he has analysed the object 
reported on E-Circular 2145 based on results of 2005 Aug 23/24.
The data were obtained under medium quality sky conditions at CBA 
Belgium Observatory, using a 0.35-m f/6.3 telescope and (unfiltered) 
ST-7XME CCD camera. Instead of stacking the images he processed the 
individual images, resulting in a total of 117 useful observations. The 
resulting light curve now shows a clear superhump profile. He used a 
number of different period analysis methods in Peranso (ANOVA, 
Lomb-Scargle, PDM, CLEANest) and they all show a strong signal at 0.058 
+/- 0.003 d. The corresponding phase diagram shows a convincing 
superhump profile. Hence, it is safe to conclude that this object is a 
new UGSU-type dwarf nova (and maybe even
an UGWZ-type dwarf nova). The superhump amplitude is about 0.3 mag.

Guy M Hurst