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M91 and NGC 4571 in Coma Berenices



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

Exposure: 15 x 8 min  (2x2 bin) exposure with UV/IR block, 8 x 4 min (3x3 bin) RGB exposures.

Processing: Data Collection -  CCDSoft (as FITs).  Calibrated, stacked (Sigma Combine), LRGB channel registration, central gradient removal, and color equalization - Astroart. Color Calibration was done with eXcalibrator.  Curves, Levels, LRGB combine and finishing  - Photoshop.  This image is a LRGB combine with Luminance layering -   Final Image size is approximately 2000x1501.

North is up in this image.  M91 is the barred galaxy in the upper right . The galaxy in the lower right is NGC 4571. These galaxies are members of the Virgo cluster of galaxies. M91 is somewhat unique in that the cluster's  velocity is about 700 km/sec toward the Earth (different from that of the Virgo cluster in general). NGC  4571 is about 58 million light years distant from Earth. M91 is approximately 63 million light years distant from Earth.  Horizontal FOV is 44'.

Image center is approximately - Equatorial 2000: RA: 12h 36m 08s Dec: +1421'42"


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

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