Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree
Contains:  NGC 7027
Getting plate-solving status, please wait...
NGC 7027 Magic Carpet CCD versus CMOS issues, 



    
        

            jerryyyyy
NGC 7027 Magic Carpet CCD versus CMOS issues
Powered byPixInsight

NGC 7027 Magic Carpet CCD versus CMOS issues

Technical card


Resolution: 1000x1000

Dates:Oct. 6, 2019

Frames:
Astrodon Blue Tru-Balance E-Series Gen 2: 12x240" ISO-1 bin 1x1
Astrodon Green Tru-Balance E-Series Gen 2: 12x240" bin 1x1
Astrodon Luminance Tru-Balance E-Series Gen 2: 24x10" bin 1x1
Astrodon Luminance Tru-Balance E-Series Gen 2: 24x5" bin 1x1
Astrodon Red Tru-Balance E-Series Generation 2: 12x240" bin 1x1

Integration: 2.5 hours

Darks: 0

Flats: 0

Flat darks: 0

Bias: 0

Avg. Moon age: 8.12 days

Avg. Moon phase: 57.84%


Basic astrometry details

Astrometry.net job: 2970642

RA center: 21h 7' 1"

DEC center: +42° 14' 9"

Pixel scale: 0.609 arcsec/pixel

Orientation: 359.981 degrees

Field radius: 0.120 degrees


Locations: Stanford Faculty Observatory, Stanford, California, United States

Data source: Own remote observatory

Remote source: Non-commercial independent facility

Description

I was encouraged to try this by this amazing image:

https://www.astrobin.com/368451/C/

Using techniques usually reserved for planetary objects. He notes:

"Due to fact it is extremely bright and small I was able to use very short exposure times - from 100 to 250ms
I collected thousands of frames which allow me to rebuild depth and create nice, easy to stretch stack.
Scale of the picture is around 0,136''/pix !!"

So I was encouraged to try this with my new Stellarvue. Unfortunately I could not stack short exposures in the same manner as Lukasz. I could stack down to 1s exposures using video software, but there was just too much noise.

He notes further: "I see that you used STT 8300M camera which have 9,3e- readout noise.
My camera (ASI178) has only 1,2e- so its 7x less. It's huge gap and I consider it that this is main focus why you don't have good results. Simply, very weak signal is covered by readout noise, and this is impossible to pump it up during stacking process."

In understand form another friend, Rob, that the reason for this is that the read noise in most CCDs is too high because of the charge transfer design.

Thus, I have concluded that you cannot do this with my camera, but I post the image as a learning exercise and perhaps it will avoid others going down this route.

Comments

Author

jerryyyyy
jerryyyyy
License: None (All rights reserved)
580
Like

Sky plot

Sky plot

Histogram

NGC 7027 Magic Carpet CCD versus CMOS issues, 



    
        

            jerryyyyy