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:  IC 1396
Getting plate-solving status, please wait...

Elephant Trunk - First Light with ASI1600

Technical card

Resolution: 4410x3182

Dates:Sept. 12, 2019Sept. 13, 2019Sept. 14, 2019

Astrodon Ha 5 nm: 64x300" (gain: 139.00) -15C bin 1x1
Astrodon Ha 5 nm: 14x600" (gain: 139.00) -15C bin 1x1
Astrodon OIII 3 nm: 77x300" -15C bin 1x1
Astrodon SII 3 nm: 47x300" (gain: 139.00) -15C bin 1x1
Astrodon SII 3 nm: 30x600" (gain: 139.00) -15C bin 1x1

Integration: 23.0 hours

Darks: ~20

Flats: ~20

Bias: ~20

Avg. Moon age: 14.15 days

Avg. Moon phase: 98.98%

Bortle Dark-Sky Scale: 3.00 job: 2929540

RA center: 324.085 degrees

DEC center: 57.850 degrees

Pixel scale: 1.475 arcsec/pixel

Orientation: 228.936 degrees

Field radius: 1.114 degrees

Locations: Sierra Remote Observatory, Auberry, California, United States

Data source: Own remote observatory

Remote source: Sierra Remote Observatories


I recently installed a Takahashi FSQ106 and ZWO ASI1600 on top of the Planewave. I was concerned that this added weight at both ends (counter weight too) would degrade the guiding performance of the Planewave. It does seem to have more variation in the model error, but my guide error is close to where it was before. The model error moved up from 5a-s to 12a-s, and my guide error is usually in the 0.5" rather than 0.4" range.

But this does not impact the results from my 1.46" image scale on the Tak! The resolution I'm seeing from this little scope is quite nice! I haven't got things completely dialed in but I have been able to capture good data.

This is a SHO image with the following blend:

Red = SII+33%Ha
Green = SII25%+Ha 50%+OIII25%
Blue = OIII
Luminance = Ha
Star color is SHO

Pre-processing in CCDStack and Post-processed in Photoshop.
Post-processing included lane darkening with a High Pass filter, Sharpening with Unsharp Mask, Luminance noise reduction via Topaz, color noise reduction with Gaussian Blur and Dust and Scratches.



Kevin Morefield
License: None (All rights reserved)



color balance


Contrast, color balance, dodge and burn


This is a quick starless version. I used StarNet++ to create a starless version, and then did a difference layer over the original. That allow me to better select the stars and let the PS fill command to the star replacement. I was also able to deselect some non-star areas. Since I don't have any plans for this I didn't do a full job clean up. Just for fun!

Sky plot

Sky plot


Elephant Trunk - First Light with ASI1600, 


            Kevin Morefield