M 13

M 13 – Great Hercules Globular Cluster

04.06.2011 00:35 to 04.06.2011 03:30
Ambient conditions: 15°C, transparency 3/5, seeing 4/5, windy and high thin clouds.
Location: Germany

Telescope: Deltagraph 300 f/3.3
Mount: GM2000QCI
Camera: SXVF-M25C
Guiding scope: Orion short tube 80mm f/5
Guiding camera: ATIK 16IC
Filters: IDAS LPS

Software: Maxim DL 5
FOV, Image scale: 62.5 x 54.8 arcmin, 1.62 arcs/pixel
Sub-exposures: 2h 05min (25 x 5min) lights with 3 pixels dithering
Calibration frames: 50 x 15ms T-shirt flats, 50 bias

Maxim DL 5: Calibration and Stacking with SDMask.
CS3: Curves & Levels, GradientXterminator, Carboni´s Actions: star color enhancement and deep space noise reduction.

Minimum of processing steps to preserve stars. The astrograph was previously collimated with Baader laser collimator, fine-tuned on stars. One day before, the PEC of the new 10-Micron mount was trained. The lights were taken with activated A-PEC. The tracking was just perfect and the mount guides the 25kg heavy astrograph like a feather even in that windy night.

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