Hemisphere:  Northern  ·  Contains:  NGC 281
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NGC 281 (Sh2-184) Nebula in Ha, 


            Mike Oates
NGC 281 (Sh2-184) Nebula in Ha
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NGC 281 (Sh2-184) Nebula in Ha

Technical card

Imaging telescopes or lenses: Takahashi FSQ-106 ED

Imaging cameras: Starlight Xpress SX-814 Trius Monochrome CCD

Guiding cameras: Starlight-XPress Lodestar Autoguider

Software: Sequence Generator Pro  ·  Photoshop CS6  ·  PIXINSIGHT 1.8

Filters: Ha 3nm

Accessory: Lakeside Astro Motor Focus System  ·  Starlight Xpress SX 'Maxi wheel'  ·  Starlight Instruments FTF3545B-A Focuser

Dates:Oct. 16, 2019

Astrodon 3nm SII: 22x1200" bin 1x1
Ha 3nm: 30x600" bin 1x1

Integration: 12.3 hours

Avg. Moon age: 17.18 days

Avg. Moon phase: 93.53%

Bortle Dark-Sky Scale: 8.00

Mean SQM: 18.30

Basic astrometry details

Astrometry.net job: 2994564

RA center: 0h 51' 40"

DEC center: +56° 39' 0"

Pixel scale: 1.434 arcsec/pixel

Orientation: 359.738 degrees

Field radius: 0.892 degrees

Resolution: 3414x2894

Locations: The Hills Observatory, Manchester, United Kingdom

Data source: Backyard


This is a deep image taken with Astrodon 3nm Ha filter. The conditions for two of the three nights this was imaged over were very poor with full Moon and an average SQM-L of 18.0, while the best night was 18.8 and no Moon. Most of the images were taken on the poor nights. This just goes to show how valuable narrow band filters are for those with poor skies.

So going deep on this means it looks very different to most images of this nebula and appears much larger.

All processing in PixInsight and final touches in Photoshop.



Mike Oates
License: None (All rights reserved)

Sky plot

Sky plot


NGC 281 (Sh2-184) Nebula in Ha, 


            Mike Oates