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A great start there.
A strategy for this type of camera would be to expose longer with the lens stopped down to the point where there is no chromatic aberration or coma from the lens (some are fine wide open but these are few and far between) and use lower ISO like 800 (OMD EM5 is rated at ISO826 by DXOMark ( I use the DXOMark sensor rating for highest ISO before image degradation as a guide). That may need 5 minutes of exposure.
You can use long exposure noise reduction or take a few darks and subtract in Photoshop or CCDstack or whatever you use.
Build the image up like any deep sky shot. As always longer exposure builds the signal at a dark site and you can get better and better images by building the signal.
Greg.
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