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            Bob J
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Imaging telescopes or lenses: Celestron RASA 11" f/2.2 Astrograph

Imaging cameras: ZWO ASI 294MC Pro

Mounts: iOptron CEM120 EC2

Software: Main Sequence Software Sequence Generator Pro  ·  PixInsight 1.8

Filters: Optolong 2" UV/IR Cut

Accessory: Starizona Filter Slider  ·  PrimaLuceLab ECCO  ·  PrimaLuceLab Eagle 3S  ·  PoleMaster  ·  Starizona MicroTouch Autofocuser  ·  Alnitak Flat Man

Dates:Sept. 22, 2019

Frames:Optolong 2" UV/IR Cut: 80x120" (gain: 71.00) -10C bin 1x1

Integration: 2.7 hours

Darks: ~40

Flats: ~50

Flat darks: ~50

Bias: ~50

Avg. Moon age: 22.54 days

Avg. Moon phase: 45.83%

Bortle Dark-Sky Scale: 4.00

Temperature: 21.00

Astrometry.net job: 3249253

RA center: 1h 33' 51"

DEC center: +30° 39' 33"

Pixel scale: 1.544 arcsec/pixel

Orientation: 5.300 degrees

Field radius: 1.036 degrees

Resolution: 3984x2734

Data source: Backyard


After wasting several nights of imaging due to a real strange mottling effect in my images which I could only see once I integrated them, I found the problem. I decided to take off my dew shield and clean the camera window. Well I didn't have to go that far.

Apparently an arachnid decided to make his home on the corrector plate of the RASA. It was entirely covered with webs. Man those little suckers work fast. Well he met his demise! LOL!!

This is the result of the eviction and termination of the 8 legged monster and his web!



Bob J
License: Attribution-NonCommercial-ShareAlike Creative Commons

Sky plot

Sky plot




            Bob J