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Astrophotography by Bob Franke

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NGC 7394 - Open Cluster

 

Click the image for a 73% size wide field view. (2850 x 1900 - 1.78 MB)

Instrument

12.5" RCOS @ ~ f/9 (2880 mm fl) at 0.64 arcsec/pixel. Shown at  0.88 and 1.89 arcsec/pixel.

Mount

Paramount ME

Camera

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

Acquisition Data

10/1/2020 & 10/3/2020 Chino Valley, AZ. with CCD Commander & TheSkyX.  AOL guided

Exposure

RGB

 240 min (16 x 5 min. each) Bin 1x1

Software & Processing Notes

 

  • TheSkyX, CCDStack, PixInsight, Photoshop CS6.

  • eXcalibrator v6.2 for (g:r),(b:r) color balancing, using 1,199 stars from the Pan-STARRS database.

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

  • CCDStack to calibrate the sub exposures.

  • PixInsight processing includes CosmeticCorrection,  data  rejection, mean combine the sub-exposures, MureDenoise, create the RGB image, gradient removal and non-linear stretching with HistogramTransformation, BackgroundNeutralization and StarNet to create a star mask.

  • PhotoShop for additional background neutralization and JPEG creation.

Comment

 

The cluster is shown rotated 165 clockwise.

John Herschel discovered NGC 7394 in 1829, in the constellation Lacerta and catalogued it as a cluster. NGC 7394 is a beautiful scattered group of 10 or 12, 9 to 11 magnitude stars. There is little written about the cluster. It is quite possible that NGC 7394 is simply a random grouping of stars. Interestingly, the Simbad database does not give it an object type it all. However, NED does indicate that it is in fact a cluster.