Sh 2-9 and Messier 4

Posted by DeanCCD
on Friday, April 17, 2009

by Dean Salman


Messier 4 which is a famous globular cluster is a common image, but unknown to many is a fantastic example of reflection and emission nebule mixed together.  Sh 2-9 is not a large nebula as seen next to M4, but has a nice reflection in the middle.  This image was taken with the E-180 F/2.8 astro graph and the ST-10 XME CCD.  Hydrogen Alpha filter was used to help bring out the nebula but a RGB composite was needed to preserve the reflection nebula.  The total exposure was 5 hours and 10 minutes.

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