NGC 6888 - Crescent Nebula (Daniel.P)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent nebula · NGC 6888 · Sh2-105

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NGC 6888 - Crescent Nebula

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NGC 6888 - Crescent Nebula

Last may, I selected NGC6888 to test my new OIII 5nm filter together with the Ha.

The APO still need some further collimation.

But more importantly, I struggle to get my AZ mount to work properly. It showed large and erratic periodic error (not sure so periodic after all). Even the the AO was not able to correct as it exceeded AO limits. This is why the resulting image is not sharp and show some "trails".

But I found the filter very good at displaying faint OIII extensions of the nebula, despite the short integration time (2 x 15 mn). These extensions where not visible on previous image taken with QHY8L on my C8 even after few hours of integration.

The processing was done in PI as follow :

For each Ha & OIII channels :

- Flat Field Dark Substraction

- Flat Field Integration

- Images Calibration (Dark Substraction and FF correction)

- Cosmetic Correction

- Image Registration

- Image Integration

- Noise Reduction (Demure)

Create HOO color image :

- Nonlinear Image Creation

- Color Balance on the nebula

- SCNR noise reduction (green neutral)

Final image adjustments performed in Iphoto on Imac (levels adjustments)

Improvements planned :

Finalise APO collimation

Increase sub expose duration to 10 to 20 mn to benefit from the dark sky

Acquire RGB data to display stars in more natural colors

Get my mount work again or change mount (this is what I did finally)

ZWO ASI1600MM/QHY163M

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Status	Advanced success
Started	...
Astrometry.net job	2253981
PixInsight job	FPF89VAL6C4I6JQWJUA17IBIISXZAJXT
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	20h12m40s.643
RA (top/left)	20h15m39s.390
RA (top/right)	20h09m41s.100
RA (bottom/right)	20h09m39s.807
RA (bottom/left)	20h15m42s.617

Dec (center)	+38°19′45″.47
Dec (top/left)	+37°52′43″.19
Dec (top/right)	+37°53′00″.25
Dec (bottom/right)	+38°46′28″.76
Dec (bottom/left)	+38°46′13″.10

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NGC 6888 - Crescent Nebula

NGC 6888 - Crescent Nebula

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Image Index:

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NGC 6888 - Crescent Nebula

NGC 6888 - Crescent Nebula

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