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Astrophotography by Bob Franke

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NGC 129 - Open Cluster

 

Click the image for a 67% size wide field view. (2400 x 1600 - 1.24 MB)

Instrument

12.5" RCOS @ ~ f/9 (2880 mm fl) at 0.64 arcsec/pixel. Shown at  0.95 and 3.05 arcsec/pixel.

Mount

Paramount ME

Camera

SBIG STL-11000 w/ FW8 filter wheel & AstroDon Gen-2 RGB filters.

Acquisition Data

10/2/2017 to 10/6/2017 Chino Valley, AZ. with CCD Commander & CCDSoft.  AOL guided

Exposure

RGB

 480 min (16 x 10 min. each) Bin 1x1

Software & Processing Notes

 

  • CCDSoft, CCDStack, PixInsight, Photoshop CS6.

  • eXcalibrator v6.2 for (g:r),(b:r) color balancing, using 533 stars from the Pan-STARRS database.

  • CCDBand-Aid to repair KAI-11000M vertical bars.

  • CCDStack to calibrate all sub exposures.

  • PixInsight processing includes CosmeticCorrection, data  rejection, mean combine all the sub-exposures, create the RGB image, gradient removal and non-linear stretching with HistogramTransformation.

  • PhotoShop for additional background neutralization and background smoothing.

  • Noiseware 5, a PhotoShop plug-in.

Comment

 

The cluster is shown rotated 160 clockwise.

NGC 129 is an open cluster in the constellation Cassiopeia. It was discovered by William Herschel in 1788. It is located almost exactly halfway between the bright stars Caph (β Cassiopeiae) and γ Cassiopeiae. It is large but not dense and can be observed by binoculars, where the most obvious is a small triangle of stars of magnitude 8 and 9, located in the center of the cluster. NGC 129 is at a distance 5,400 light-years and is about 76 million years old.
Source: WikipediA