Hemisphere:  Northern  ·  Contains:  IC2159  ·  NGC 2174  ·  NGC 2175  ·  NGC2174  ·  NGC2175  ·  Sh2-252
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NGC 2174 - Monkey Nebula (SOH & HSO), 


            Rich Sky
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NGC 2174 - Monkey Nebula (SOH & HSO)

Technical card

Astrometry.net job: 3261166

RA center: 6h 9' 28"

DEC center: +20° 39' 24"

Pixel scale: 3.941 arcsec/pixel

Orientation: 83.399 degrees

Field radius: 0.958 degrees

Resolution: 1313x1158

Locations: UGG-419 Observatory, Canada, Canada

Data source: Backyard


The Monkey head nebula acquired and processed in H-S-O and S-H-O (version b) using the Rasa 200mm, ASI 1600MM cool pro and Baader UFC adapters and Baader highspeed filter set.

This last image completes my project to understand the performance of my equipment, including mis-alignment and the cmos performance.

The main point of my evaluation are the following:
1- Cmos monochrome imaging appears to be easier than OSC.
2- Guiding and guiding calibration for my setup seems to be more important than mis-alignment.
stars shadows are related to poor pole alignment instead of gear miss-alignment
3- the use of filters greatly enhance images and simplify processing, specifically at Bortle index 8
4- The Asi 1600 MM camera is for me, surprisingly efficient and without issues
5- Narrowband processing is easy, but one needs to accept false colors with some of the choices that are made like using HSO or SHO or other combination.
6- Oxygen light exposure will be increased over the other filters
7- Unity g. seems to provide good results

Monochrome Narrowband imaging is fun and the details that are shown during an imaging session are just beyond what I expected.
Future images will only show, the final 3 or 4 filter processed stack.



Rich Sky
License: None (All rights reserved)


  • Final
    NGC 2174 - Monkey Nebula (SOH & HSO), 


            Rich Sky
  • NGC 2174 - Monkey Nebula (SOH & HSO), 


            Rich Sky


Description: SHO-version 60% S-II + 40% H-a, 30% S-II + 30 H-a + 30% O-III, 100% O-III

Sky plot

Sky plot


NGC 2174 - Monkey Nebula (SOH & HSO), 


            Rich Sky