M15, Great Pegasus Globular Cluster, 24 Aug 2012 (David Dearden)

Celestial hemisphere: Northern · Constellation: Pegasus (Peg) · Contains: M 15 · NGC 7078

M15, Great Pegasus Globular Cluster, 24 Aug 2012

M15 was easy to find in the eyepiece. This is my first experiment with deliberate RA-only dithering, but the guiding was terrible because I wasn’t careful about balancing the mount well. The result is football-shaped stars, but not too horrible (though I threw out about half the subframes). Still, globulars are relatively easy and are pretty objects. I reduced the exposure and still managed to blow out the core a little.

Date: 24 Aug 2012

Subject: M15, Great Pegasus Globular Cluster

Scope: AT8IN

Filter: None

Mount: CG-5 (Synta motors)

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

Camera: DSI IIc (cooled at 2 A, 7.5 V, 8.5 °C)

Acquisition: Nebulosity 3.1.0

Exposure: 31 x 120 s

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

Processing: Digital development with aggressive sharpening, slight Keller stretch, power stretch, saturation boost in Neb 3; CS6 Astronomy Tools deep space noise reduction, star color enhance.

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Status	Basic success
Started	...
Astrometry.net job	7578965
PixInsight job	n/a
PixInsight queue size	n/a
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