Date: 10/20/2019
Description: NGC 6888 is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It was discovered by William Herschel in 1792 It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000 to 400,000 years ago. [Ref: WikiPedia]
Sky Conditions: Clear skies most of the nights, FWHM: 2.6 arc sec/pixel
Imaging: Exposure: 60min H-alpha (6x600sec) at 2x2bin and 60 min RGB each (6 x 600sec/ea.) at 2x2 bin using RGB filters
Guiding: ProTrac assisted guiding - 10 sec guide exposure
Equipment:
FLI 8300 CCD (LRGB filters), cooled to -30deg C
AT12RC at F8
Starlight Focuser
NOAG with StarlightXpress Lodestar II guide camera
Paramount ME Mount
SW:
SkyX, PixIsight - calibration with darks, flats, bias and color correction
Observatory site : Northern VA