SH2-170 - AstroClassifieds Photo Gallery

Object Description:

This is a dim emission object, radiating primarily in the hydrogen wavelengths. Located in Cassiopeia, near the boarder with Cepheus. It is positioned near its much more famous and prominent neighbor, NGC7822.

I attempted to go as "deep" as possible so as to pick up as much of the faint surrounding area as I could.

Date Taken:

- 9/30/2007 through 10/29/2007

Equipment Used:

- TMB 203 F/7

- SBIG STL-6303

- Paramount ME

- Optec 3" rotator

- Starlight Instrument's Digital Feather Touch Focuser, (with electronic focusing)

- Astroden narrowband filter, 6nm Ha

Exposures:

- Ha: 38x30 minutes (19 hours)

Processing:

CCDStack:

1) Calibration with darks, flats, and bias frames

2) Bloom rejection

3) Impute (minor) bloomed pixels

4) Image registration

5) Normalization (Auto)

6) Data rejection (Poisson sigma)

7) Mean combine

8) Hot/Cold Pixel rejection

9) Impute hot/cold pixels

10) Deconvolution, Positive Constraint, 25 iterations

Photoshop CS2:

1) Noise removal (NeatImage)

2) Shadow-highlight to bring up the background data, and to slightly reduce the main object highlights

3) Noel Carboni’s Photoshop action for “local contrast enhancement”

4) Multi-layer, differing radii, high pass sharpening/contrast layers

5) Sharpening

6) Minor overall contrast curve