Focal Pointe Observatory
Astrophotography by Bob Franke

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Abell 426 - The Perseus Cluster

 

Click the image for a larger FOV. (2400 x 1600 1.17 MB)

Instrument

12.5" RCOS @  ~f/9 (2880 mm fl) at 0.64 arcsec/pixel. Shown at 3.40 and 1.06 arcsec/pixel.

Mount

Paramount ME

Camera

11/13/2010 to 1/3/2011 Chino Valley, AZ... with CCDAutoPilot3 & CCDSoft.  AOL guided

Acquisition Data

2/25/2012 to 3/24/2012 Chino Valley, AZ... with CCDAutoPilot5 & CCDSoft.  AOL guided.

Exposure

 Lum (no filter) 465 min (31 x 15 min, bin 1x1)

RGB

765 min (17 x 15 min each, bin 2x2)

RGB ratios are 1.00, 0.94 & 1.06

Software

  • CCDSoft, CCDStack, Photoshop CS6, PixInsight and Noel Carboni's actions.

  • eXcalibrator v4.36 for (g:r) color balancing, using 229 stars from the SDSS-DR9 database. 

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

  • CCDStack to calibrate all sub exposures, register and stack the color and create the RGB image.

  • PixInsight processing includes registering and stacking the luminance, gradient repair, non-linear stretching with HistogramTransformation, HDRMultiscaleTransform and LRGB creation.

  • PhotoShop for the final touch-up. 

  • Noiseware 5, a PhotoShop plug-in.

Comment

North is to the top.

The Perseus galaxy cluster (Abell 426) is about 250 million light-years from our galaxy and contains more that 500 catalogued galaxies. The brightest member is NGC 1275, near the left edge of the image, at magnitude 11.6. NGC 1275 is a strong source of radio waves and x-rays.

Abell 426 is the dominant member of the Perseus-Pisces supercluster. The super cluster extends to 300 million light-years and covers 40 degrees of the winter sky.