Focal Pointe Observatory
Astrophotography by Bob Franke

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M9 & Barnard 64

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Click the image for a ~ 75% size view. (1500 x 1000 - 1.06 MB)
Click here for 150% crop of M9 (1200 x 800 - 0.89 MB)

Instrument

12.5" RCOS @ ~ f/9 (2880 mm fl) at 1.28 arcsec/pixel. Shown at  0.85, 1.71  and 3.42 arcsec/pixel.

Mount

Paramount ME

Camera

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

Acquisition Data

6/19/2018 to 8/7/2018 Chino Valley, AZ.  with CCD Commander & CCDSoft.  AOL guided

Exposure

RGB

720 min (16 x 15 min. each) Bin 2x2

eXcalibrator RGB ratios are 1.00, 1.13 & 1.24

Software & Processing Notes

  • CCDSoft, CCDStack, PixInsight, Photoshop CS6.

  • eXcalibrator v6.1 for (g:r),(b:r) color balancing, using 262 stars from the Pan-STARRS database.

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

  • CCDStack to calibrate the sub exposures.

  • PixInsight to register, data  reject, mean combine the sub exposures and create the RGB image. Also for gradient removal, non-linear stretching with HistogramTransformation and color saturation.

  • PhotoShop for selective sharpening and JPEG creation. 

Comment

 

The north is ~ to top, the view is rotated 15 clockwise.

Messier 9 or M9 (also designated NGC 6333) is a globular cluster in the constellation of Ophiuchus at a distance of about 26,000 light years. Charles Messier discovered the cluster on June 3, 1764. M9 is passing through an interstellar dust cloud that dims and slightly reddens it's light.

Below and to the right is the more distant dark nebula, Barnard 64.