NGC 7023, Iris Nebula (David Dearden)

Image of the day 07/12/2012

NGC 7023, Iris Nebula

The Iris was surprisingly easy to find with the Telrad; there are ample stars around on which you can line up. The central nebulosity is easy to see at 30 s exposure, and probably would be visible with 5 s without problems. Terrible wind conditions tonight, so I'm just hoping it will get calmer as the night rolls on (and that was the forecast, but it actually got worse). I'm running RA-unbalanced again, and have excellent guiding (except when the wind is shoving me around, which is often). Darks are not well temperature matched in this image.

The revised version follows the recommendations of Matt McBee in the comments below. I think it is a vast improvement. Details of what I did: Digital development with sharpening, power stretch, curves, star reduction in N3, separate layer with GREYCStoration, CS5 color blotch, deep space, & space noise reduction in the GREYCStoration layer, then layer mask with a Gaussian blur to preserve enhancement in the center and remove noise from periphery; saturation boost the flattened image.

Date: 10 Jul 2012

Subject: NGC 7023, Iris Nebula

Scope: AT8IN + 0.5x Antares telereducer

Filter: none

Mount: CG-5 (Synta motors)

Guiding: Orion ST80 + 0.5x Antares telereducer + DSI Ic + PHD

Camera: DSI IIc

Acquisition: Nebulosity 3.0.8

Exposure: 60x180 s

Stacking: Neb 3, bias included, normalize first, auto quality screen, trans+rot align, 1.5 SD stack

Processing: Digital development with sharpening, power stretch, GREYCStoration, saturation boost in N3, CS5 levels, Astronomy Tools color blotch reduction, deep space noise reduction, star color enhance, star reduction, saturation boost.

Original
B
Final
C

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Status	Basic success
Started	...
Astrometry.net job	6622338
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Image of the day 07/12/2012

NGC 7023, Iris Nebula

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NGC 7023, Iris Nebula

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