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M3 in Canes Venatici



Scope: C8 203 mm at f/6.3, Location: Blair Valley, Anza Borrego Desert, CA   12 April 2013   Camera: ST8300M

Exposure: 16 x 2 min  (1x1 bin) exposures with UV/IR block, 10 x 1 min (2x2 bin) RGB exposures.

Processing: Data Collection -  CCDSoft (as FITs).  Calibrated, stacked (Sigma Combine), LRGB channel registration, central gradient removal, and color equalization - Astroart.  Curves, Levels, LRGB combine and finishing  - Photoshop.  Final color Calibration with eXcalibrator. This image is a LRGB combine with Luminance layering -   Final Image size is approximately 2000x1500.

North is up in this image. M3 is one of the Milky Way Galaxy Globular Clusters whose age is somewhat uncertain - Baade's  estimate is 5 billion years.  M3 spans about 180 light years in its width. It is at a distance of about 33,900 light years from Earth.  This image replaces an earlier image that can be seen in the Archives here. Horizontal FOV is 55'

Image center is approximately - Equatorial 2000: RA: 13h 42m 12.0s Dec: +2823'00"


All images and content remain the property of Jim Thommes - copyright 2003 - 2013

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