Electronic Telegram No. 1876 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) CBAT@CFA.HARVARD.EDU (science) URL http://www.cfa.harvard.edu/iau/cbat.html PN G75.5+1.7 Last July, D. M. Jurasevich, Mount Wilson Observatory, discovered and reported that H-alpha CCD images taken on 2007 June 19.22 and 2008 July 6.17 UT, using an Astro-Physics 160EDF apochromatic refractor (+ SBIG STL-11000M CCD camera + 6-nm Tru-Balance H-alpha filter) reveal a near-spherical shell of gas, located within a faint H II region near NGC 6888, that was apparently not noticed (or published) previously due to the density of stars and gas in that area of Cygnus. This shell appears as a slightly elongated ellipse with its major axis at p.a. 5 deg and having an apparent size of 260" x 235"; its center is located at R.A. = 20h15m22s.2, Decl. = +38d02'58" (equinox 2000.0); Jurasevich has posted photographs and other information regarding this nebula at website URL http://tinyurl.com/ku4ppy. The nebula was independently noted and reported by K. B. Quattrocchi (Clovis, CA, U.S.A.) and M. Helm (Fresno, CA, U.S.A.), who originally found it on eight separate 10-min images taken on 2008 July 17.75 with a 40.6-cm f/3.75 astrograph (+ FLI Microline 16803 CCD camera + H-alpha filter) located at the Sierra Remote Observatories in the Sierra Nevada Mountains, providing the position end figures of the nebula as 21s.5, 43"; they have posted photographs and other information on this nebula at website URL http://www.lostvalleyobservatory.com/page29crescentbubblenb/. A. Acker, Observatoire Astronomique Strasbourg, notes that the "INT Photometric H-alpha Survey of the Northern Galactic Plane" (IPHAS; cf. Gonzalez-Solares et al. 2008, ASP Conf. Ser. 394, 197; Gonzalez-Solares et al. 2008, MNRAS 388, 89) lists an object a couple of degrees away at R.A. = 20h15m22s.2, Decl. = +40d34'44".8. L. Kohoutek, University of Hamburg, writes that he can see PN G75.5+1.7 on both red and blue "transparencies" of the second Palomar Sky Survey (but not on the first POSS photographs), noting that the nebula is extremely faint there (only a trace), but having the same size as on the current images. Also, the blue star in the center is of similar brightness at all epochs; this does not support a nova nebula, as the nebula has not changed in about sixteen years. Spectroscopy is encouraged, though this will be difficult because of its faintness. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2009 CBAT 2009 July 16 (CBET 1876) Daniel W. E. Green