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Michael A. Stecker
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NGC 6781
NGC 6781 is a planetary nebula about 1,500 light-years from Earth in the constellation Aquila. Its visual magnitude is 11.4, spanning 1.9 X 1.8 arcminutes. The central white dwarf star is magnitude 16. file: NGC6781-120sX33Cel925f7P2a-7152023cr1c.jpg Photographic Data telescope: Celestron 9.25-inch EdgeHD SCT at f/7 (focal length= 1,650 mm)
mount:
ZWO AM5 harmonic/strainwave Mount Guide Settings in Asiair Plus: Calibrate Step: 5,000 ms Dec Duration: 3,000 ms RA Duration: 2,000 ms Aggression: 50% for both RA & Dec Exposure time for guiding: 1 second
Guiding hardware:
SVBony 60 mm f/4 guidescope (fl=240 mm) Guide Camera: ZWO ASI662MC color planetary camera (2.97 micron pixels) controller/computer ZWO Asiair Plus via WiFi to Samsung S7+ tablet . imaging camera: ZWO ASI533MC-Pro one-shot color astro-camera cooled to 14-degrees F with Optolong L-Pro light pollution filter . exposures: 120 seconds X 33 (66-minutes)
processing
Stacked in Asiair Plus and cropped and post-processed in Adobe Photoshop Elements . photographic site: West Los Angeles http://mstecker.com/pages/chhouses_fp.htm (Bortle 9 light polluted sky) |
