Celestial hemisphere:  Southern  ·  Constellation: Sagittarius (Sgr)  ·  Contains:  M 22  ·  NGC 6656
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M22, Great Sagittarius Globular Cluster, David Dearden
M22, Great Sagittarius Globular Cluster
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M22, Great Sagittarius Globular Cluster

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Description

Very windy, so I threw out a few subframes, but this turned out OK.

Date: 27 Jul 2012

Subject: M22, Great Sagittarius Globular Cluster

Scope: AT8IN + 0.5x Antares telereducer

Filter: none

Mount: CG-5 (Synta motors)

Guiding: Orion ST80 + 0.5x Antares telereducer + DSI Ic + PHD

Camera: DSI IIc

Acquisition: Nebulosity 3.0.9

Exposure: 74x60 s

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

Processing: N3 crop, color balance, digital development with 2 levels of sharpening, a little Keller curve, saturation boost. CS5 curves & levels. AT make stars smaller, star color enhance, and saturation boost.

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M22, Great Sagittarius Globular Cluster, David Dearden