NGC6888 in narrow band

[TerryMcK]

I've been playing around with the Crescent Nebula and this has been a long project so far due to the poor weather we have had this summer in the UK.

This combines about 4.5 hours of OIII and 3 hours of SII that I captured in the evening of 13-09-2020/morning 14-09-2020 with some Ha data (I think it was 4 hours) captured late August. Unfortunately my Ha data was 30 degrees rotated from the OIII/SII data due to me installing ..... a camera rotator(!) - in between sessions. On the Hubble ST they call it a maintenance mission! Anyway I still had enough to get a decent crop.

With luck I am (hopefully) going to capture some more Ha tonight 14-09-2020 this time with the correct camera orientation.

I shunned the SHO Hubble pallet as it was too green and went for a mapping of Ha-red, OIII-Green and SII-blue for this image. Looking at the stretched SII data it did indeed have some nebulocity - faint but definitely there. As usual the jpg does not do the image justice.

• Camera ZWO ASI183MM Pro - Ha, OIII and SII filters,
• Scope William Optics ZenithStar 103 with x 0.8 field flattener (FL568mm at f5.5)
• Processed in APP, PixInsight and PhotoshopCC 2020

 

Edited September 14, 2020 by TerryMcK

[MarkAR]

Looks good, like the HOS combination.

[TerryMcK]

Thanks Mark. I need to reduce the magenta halos around some of the stars and need to watch the Ikarus observatory SGL Pixinsight processing talk on Youtube again.

[AstroNtinos]

Excellent image. Well done.

[TerryMcK]

I managed to get some Ha on NGC6888 this time with the same orientation as the OIII and SII last night 18/09/2020 and processed the results in SHO Hubble Pallet.

Processed with AstroPixelProcessor, Pixinsight and Photoshop CC 2020. I believe there is a way of integrating the other (rotated) Ha data using AstroPixelProcessor to create a more detailed image but I need to experiment with that.

[TerryMcK]

I have been working on NGC6888 again based upon the data I collected back in August/September 2020 and processed in PixInsight in my Bortle 7/8 skies with no real darkness. 

• Telescope: William Optics ZS103 with x0.8 flattener/reducer
• Camera: ZWO ASI183MM Mono
• 154 x Ha subs at 3 minute duration. Gain 111. Offset 8
• 90 x OIII subs at 3 minute duration. Gain 111. Offset 8
• 43 x SII subs at 3 minute duration. Gain 111. Offset 8
• Processed as HOS with PixInsight and cropped.

I tried HSO and SHO but liked the HOS much more.

 

Edited February 3, 2021 by TerryMcK

[peter shah]

A lovely image ..... the outer shell is showing nicely