Hemisphere:  Northern
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Elephant Trunk Nebula, 


            Alf Jacob Nilsen
Elephant Trunk Nebula
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Technical card

Imaging telescopes or lenses: GSO RC 254/2000 Carbon OTA

Imaging cameras: ZWO ASI1600 Pro

Mounts: iOptron CEM60-EC

Guiding telescopes or lenses: Skywatcher EvoGuide 50ED

Guiding cameras: Starlight Xpress Lodestar 2

Software: Astro Pixel Processor APP  ·  Adobe Photoshop CC  ·  PixInsight Core Version 1.8 Ripley

Filters: ZWO EFW 7x36mm LRGB Ha, Oiii, Sii  ·  IDAS (Tokai) LP-filter

Accessory: Optec TCF-S

Dates:Sept. 18, 2020

Baader 36mm B: 19x300" (gain: 300.00) bin 2x2
Baader 36mm G: 18x300" (gain: 300.00) bin 2x2
Baader 36mm Ha 7nm: 19x300" (gain: 300.00) -20C bin 1x1
Baader 36mm L: 19x300" (gain: 300.00) -20C bin 1x1
Baader 36mm R: 18x300" (gain: 300.00) -20C bin 2x2

Integration: 7.7 hours

Darks: ~20

Flats: ~20

Avg. Moon age: 1.21 days

Avg. Moon phase: 1.64%

Basic astrometry details

Astrometry.net job: 3882110

RA center: 21h 35' 39"

DEC center: +57° 30' 21"

Pixel scale: 0.906 arcsec/pixel

Orientation: 329.064 degrees

Field radius: 0.322 degrees

Resolution: 2000x1600

Locations: Osmundstø Observatorium (private backyard observatory), Hidrasund, Vest Agder, Norway

Data source: Backyard


I used my 10'' RC f8 for this 233 x 300sec HaLRGB combinition of the Elephant Trunk Nebula. Ha portion integrated with the red portion. The bright starts are burned out, shorter subs would have been to prefer. Enjoy....



Alf Jacob Nilsen
License: None (All rights reserved)

Sky plot

Sky plot


Elephant Trunk Nebula, 


            Alf Jacob Nilsen