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M57 - The Ring Nebula


From the author of   Sizing Up The Universe


M57

22:15 EDT June 26, 2008.
Starlight Express SXV-H9 on 10" RC at f/9.
Ha =140min, OIII=20min, (guided 20 minute subexposures).
PLUS: all prior exposures.
Richardson-Lucy.


M57

Brighter version
M57

02:16 EDT May 23, 2007.
Starlight Express SXV-H9 on 10" RC at f/9.
L=32.5min, Ha =30min, OIII=30min, R=15min, G=15min, B=15min (guided 2.5 and 5 minute subexposures).
Richardson-Lucy, Custom Digital Development.


M57

02:43 EDT May 5, 2005.
Starlight Express SXV-H9 on 10" RC at f/9.
L=13min, Ha =22min, R=8min, G=8min, B=8min (unguided 1-minute subexposures).
Richardson-Lucy, Curves.

NOTE: Comparison with http://c3po.cochise.cc.az.us/astro/images/M57!dss2_3.jpg reveals that the faintest stars in this image are at least mag 20.


M57

23:07 EDT Aug 10, 2005.
Starlight Express SXV-H9 on 10" RC at f/9.
Ha =122min (unguided 30-second subexposures).
Richardson-Lucy, Gamma stretch.

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