Celestial hemisphere:  Southern  ·  Constellation: Scorpius (Sco)  ·  Contains:  M 4  ·  NGC 6121
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M4, Cat's Eye Globular Cluster, David Dearden
M4, Cat's Eye Globular Cluster
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M4, Cat's Eye Globular Cluster

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Description

Date: 21 Jun 2012

Subject: M4, Cat's Eye Globular Cluster

Scope: Orion ST80 + 0.5x Antares telereducer

Filter: Baader Fringe Killer

Mount: CG-5 (Synta motors)

Guiding: AT8IN + 0.5x Antares telereducer + DSI IIc + PHD

Camera: DSI Ic

Acquisition: Nebulosity 3.0.6

Exposure: 23 x 90 s

Stacking: Neb 3, bias included, auto quality screen normalize first, trans+rot align, 1.5 SD stack

Processing: Digital development with sharpening, power stretch, GREYCStoration in N3, CS5 GradientXTerminator, levels, Astronomy Tools color blotch reduction, small saturation boost, slight color balance adjust (away from green), liberal use of healing brush (my darks failed to fully remove the hot pixels, probably because they were at lower temperature than the images)

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M4, Cat's Eye Globular Cluster, David Dearden