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M 100  (NGC  4321),  in  Coma  Berenices

     M100, a face-on spiral galaxy in the galaxy-rich constellation Coma Berenices, is a small (6 x 5 arc minute) but bright (magnitude 9.3) member of the Coma-Virgo Cluster. It lies about 65-70 million light years distant, according to Kepple & Sanner and has an estimated diameter of 130,000 light years, similar to the Milky Way's 120,000 light years. North is down in this view, and two small companion galaxies can be seen, NGC 4328 located at the 3 o'clock position and NGC 4322 located at 5 o'clock.

 Date  2002-05-04, 05
 Scope

 Astro-Physics 130 EDF at f6 on A-P 1200GTO mount; ST-4 guiding

 Meade 416XTE CCD camera with 616 color wheel controlled with MaxIm DL/CCD v3.06. Focus

 was optimized with FocusMax controlling a RoboFocus drive.

 Exposures

 L=15x600 sec, R=11x300 sec, G=11x300 sec, B=11x300 sec, all unbinned. FWHM (MaxIm) varied

 from 1.8 to 2.5 through this series, which was collected over two nights. 

 Processing 

 Calibrated and RGB assembled in MaxIm. The luminance image was enhanced with DDP in 

 MaxIm. L and RGB  combined in Photoshop, separately stretched and unsharp masked or 

 blurred and then  flattened.  This was cropped, flattened, and converted to jpg.

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