Michael A. Stecker
mastecker@gmail.com


 


NGC 7331
 Spiral galaxy NGC 7331 is 40-million light-years from Earth in the constellation Pegasus. It is thought to resemble our own Milky Way, but larger with an estimated one trillion stars. Unfortunately, the faint blue outer arms are not seen because of severe light pollution. A few smaller galaxies are seen in the field.
 file: NGC7331-180sX51P3-Pro.Cel925f7-8232023arcr2a.jpg
 

Photographic Data
telescope:
Celestron 9.25-inch EdgeHD SCT at f/7 (focal length 1,637 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 filter
 .
exposures:
180 seconds X 51 (153-minutes or 2.5 hours)
 
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)