Date: 2/10/2019, 3/4/2019, 3/23/2019, 3/27/2019
Description: NGC 3521 is a flocculen] intermediate spiral galaxy located around 26] million light-years away from Earth in the constellation Leo. It is a spiral galaxy with a trace of a bar structure (SAB), a weak inner ring (rs), and moderate to loosely wound arm structure (bc). [Ref: WikiPedia]
Sky Conditions: Thin high clouds most of the nights with half to 3/4 moon, FWHM: 2.3 arc sec/pixel
Imaging: Exposure: 180min luminous (12x600sec) at 2x2bin and 90 min RGB each (9 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