Observation by Kevin Gurney: NGC 7026

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Kevin Gurney


Kevin Gurney


2022 Sep 05 - 23:11


2022 Sep 08 - 14:27



  • Fornax 102
  • Celestron C11 Edge HD
  • ZWO ASI1600MM pro
  • Atik EFW2
  • Baader LRGB Filters

17x300s LUM, 3x300s Red, 4x300s Blue, 4x300s Green


Charente, France

Target name

NGC 7026


NGC 7026

About this image

This was the Deep Sky object for September - a planetary nebula in Cygnus. The challenge is, its pretty small (40 arcsec or so along larger axis) so showing structure may be tricky; the image here is fairly tight crop of a much larger original.

It is however quite bright and I just managed to avoid complete saturation with my normal 300s subs. However some of the bright stars do saturate, in particular the bright one right alongside (hence small artefact in the centre). If I did this again, I think I would do many more 60 subs instead.

I took some Luminance on 3rd September, then completed with further LUM and RGB on the 5th. [Acquired in Voyager and processed in Pixinsight (PI)]

Teasing out the structure required careful use of deconvolution in Pixinsight - this is usually a multi-iteration step before stretching but I also did a couple of iterations afterwards for good measure - I think it has helped.

For colour calibration, I used PIs Photometric-based tool. This compares your (plate solved) image with a catalogue of spectral qualities of the stars in your field. The result should therefore be fairly accurate. However, there is very little colour in the nebula itslef. To draw out what there, is I have increased the saturation of the image quite  a lot. The Hubble image online shows a nice mix of blue and red, but I think this is narrowband with Nitrogen and Oxygen filters. I dont have a Nitrogen filter but could be worth trying with Ha?


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Robin Leadbeater
Robin Leadbeater, 2022 Sep 30 - 18:12 UTC

Hi Kevin,

Nice detail. I think I can just see the central star too

My spectrum is here


As well as the usual [OIII], there is significant H alpha and [NII]  at 6548/6583 A .  The redshift is ~zero  so a 5nm wide (or wider) H alpha filter should catch the [NII] too if it is well centred on H alpha at 6563 A


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