20210916 - NGC 7023 (CEP) - The Iris Nebula - (not) Having the blues ….
What was the experience
I think I’m getting the hang of imaging LRGB with the filter wheel on the TS140 …
… Apart from the fact that I probably shouldn’t have planned to capture the main colour of this beautiful object (ie. blue) near the end of the shoot 😳 … and running into the morning twilight 🙄 … losing 3/4 of my blue subs 😮
Instead of expecting 18 of them, like on the LRG-filters, I ended up with … 4 😱 And not a clear night since then to catch up on this … 😖
Not smart for an object whose main colour is blue. I tried to salvage this, by pulling up the saturation on whatever was left of the blue in the pixels … and ended up triggering some stars into supernova (don’t look too close, please 🙏)
Still, not bad for just the 3rd object shooting with the TS140 and mono filter wheel. Maybe I could’ve corrected this differently in the processing, as I’m still processing this as a ‘simple’ lrgb-shot
The million dollar question for the next clear night remains … get more (autumn-) blues, or move on 🤔
What’s in the picture(s)
NGC 7023 (CEP) - The Iris Nebula -
https://en.wikipedia.org/wiki/Iris_NebulaQuote: “The
Iris Nebula (also known as
NGC 7023 and
Caldwell 4) is a bright
reflection nebula in the
constellationCepheus. The designation NGC 7023 refers to the
open cluster within the larger reflection nebula designated LBN 487.
The nebula, which shines at magnitude +6.8, is illuminated by a magnitude +7.4 star designated SAO 19158.[1] It is located near the
Mira-type variable star
T Cephei, and near the bright magnitude +3.23 variable star
Beta Cephei (Alfirk). It lies 1,300
light-years away and is six light-years across”
How it was done
Scope: TS-140 APO (FL 910mm / with x1.0 flattener)
Mount: CEM70G
Camera: ASI2600MM Pro
Guiding: @zwoasi OAG, ASI174MM, ASIAIR Pro - avg 0.40”
Filter: ZWO EFW - LRGB Baader
Resolution: 0,85”/pixel, FoV 107’
Moon: 81%(-), Bortle 5/6 SQM 19.60
Photons: Gain 100 -10c 300s (LRGB) L10x R15x G12x B4x
Darks … still need to run these
Processing: PixInsight (Mac)
Astrobin:
What have I learned from this
Still getting to grips with LRGB processing, doing this too much as straight LRGB processing perhaps … cloudy nights, YouTube tutorials, here we come 😎
Patience is a virtue, which is currently hard to live by … I still need to run the darks, and process the flats in there (don’t say it 🙄) … so image revisions on Astrobin will be dropping in 😂
Clear Skies everybody! 🤩✨🔭
IG
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