Hi Guys
NGC1871 nebula in Bi colour narrowband Ha and OIII mapped as LRB.
It has a nifty bonus bubble nebula too
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Large here.
Not oft imaged, in fact I cant find a single colour NB image of it on the interwebs
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Although described as a "bright nebula" I dont know how they figure that, for hubble maybe. One site mentioned mag 10, I dont know what that refers to exactly. Id like to describe the scene, but I cant find any info.
The Ha stack after cal, showed a background of 60 ADU, average 100 and a small peak of 500 ADU (for the nebula). OIII was worse at 25 ADU background and 100 peak. I took many hrs of SII but the ADU was 70 or less, just impossible to deal with hence Ha, OIII bicolour.
Taken on an RCOS 10" RC Scope at f9, SBIG STXL6303E Camera and PME mount at itelescopes Siding Spring Observatory over 1.5 mths Oct-Nov.
Processed with CCDstack, Star Tools and Photoshop. 83 hrs Total exposure time.
Bi colour Ha, Ha ,OIII. Mapped as LRB. Ha 75 subs at 40 min bin 1 50hrs total, OIII 50 40min subs bin2 33hrs total.
So, not a lot of dynamic range to play with, processing was a challenge, its about at the limit I can handle with a pokey 10". Its a bit garish and the pallete wont suit everyone. Some RGB was taken for stars, although that didnt help much.