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QHY183M Amp Glow example with IC 434 Horse Head Nebula, 



    
        

            BrianF
QHY183M Amp Glow example with IC 434 Horse Head Nebula
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QHY183M Amp Glow example with IC 434 Horse Head Nebula

QHY183M Amp Glow example with IC 434 Horse Head Nebula, 



    
        

            BrianF
QHY183M Amp Glow example with IC 434 Horse Head Nebula
Powered byPixInsight

QHY183M Amp Glow example with IC 434 Horse Head Nebula

Equipment

Acquisition details

Dates:
Jan. 18, 2021
Frames:
20×420(2h 20′)
Integration:
2h 20′
Avg. Moon age:
5.24 days
Avg. Moon phase:
27.97%

Basic astrometry details

Astrometry.net job: 4186280

RA center: 05h40m55s.2

DEC center: -02°2707

Pixel scale: 2.529 arcsec/pixel

Orientation: 94.350 degrees

Field radius: 0.523 degrees

Resolution: 1250x810

File size: 401.5 KB

Locations: Farm - Bortle Scale: 4, Knee Hill County, Alberta, Canada

Data source: Backyard

Description

Camera: QHY183M.

Some things to note:

This camera produces significant amp glow in the Light Frames, which can mostly be removed by:

1. Not using bias frames

2. Appling dark frames.

Also, there are non-random horizontal bands that can be seen in the darker regions like the lower left quadrant. Dark frames and flat frames do not have any effect on the banding, so I would guess it has something to do with the sensor itself. Mostly noticeable when images are stretched.

*Update.

Using https://astronomy.tools/calculators/ccd_suitability, shows the camera is slightly oversampling in Bin1x1, but has ideal pixel size in Bin2x2 for current sky conditions/telescope properties. The result is the horizontal banding is gone in subsequent tests (not shown).

-First picture stretched to show horizontal banding in lower left quadrant.

-Second picture is processed using above mentioned technique to minimize horizontal banding and amp glow.

-Third picture is Light Frames only to show amp glow on right side.

Image details:

20 Light Frames @ -20C for 420s

20 Dark Frames @ -20C for 420s

20 Flat Frames (calibrated for image)

20 Bias Frames (converted Dark Flat Frames with Deep Sky Stacker)

Gain 11

Offset 30

USB Traffic 0 (USB 3 connection)

Brian.

Comments

Revisions

  • QHY183M Amp Glow example with IC 434 Horse Head Nebula, 



    
        

            BrianF
    Original
  • QHY183M Amp Glow example with IC 434 Horse Head Nebula, 



    
        

            BrianF
    D
  • Final
    QHY183M Amp Glow example with IC 434 Horse Head Nebula, 



    
        

            BrianF
    F

D

Description: IC434 Horsehead Nebula

Uploaded: ...

F

Description: Amp Glow

Uploaded: ...

Sky plot

Sky plot

Histogram

QHY183M Amp Glow example with IC 434 Horse Head Nebula, 



    
        

            BrianF