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Old 28-08-2020, 08:56 PM
Placidus (Mike and Trish)
Narrowing the band

Placidus is offline
 
Join Date: Mar 2011
Location: Euchareena, NSW
Posts: 3,719
Wedge tailed M16, deep SHO, now with RGB stars

We've added another 13 half-hour subs in SII to our previous Eagle going back many years, to yield a total of:

Red: SII 18hrs 30 min
Green: H-alpha 4 hrs
Blue: OIII 10 hrs

BIG ONE HERE

Mixture of Aspen CG16M and FLI PL16803 cameras on 20 inch PlaneWave.

Processing was:

Deconvolution
Separate into stars and nebulosity
Stars to monochrome
Nebulosity: Balance colour, wavelet sharpen, brighten the darks
Recombine stars and nebulosity

We were particularly interested to see to what extent SII (red) was just co-localized with H-alpha (green). There are several distinct diagonal bands of thin, not-so-bright diagonal bands of SII in the bottom left corner, and the huge "pineapple donut" or "millstone" structure at top right has a thin rim which is relatively strong in SII.

(We attempted doing another night of H-alpha last night, but the half-moon was ramming straight down the barrel, and we got a Moonlight Sonata. Tonight would be even worse. So that's it for this month.)

EDIT: We now have added 90 minutes per channel of RGB stars. Technique: Separate RGB into stars and starless. Take brighter of RGB stars and starless SHO. All done using our own GoodLook. BIG ONE HERE.

Best,
Mike and Trish
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Last edited by Placidus; 05-09-2020 at 11:58 PM.
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