M13 Hercules cluster

2nd June 2006
Object name: M13 Hercules cluster
Object type: Globular Cluster
Size: 20
Classification: V
Apparent RA: 16 41 41.5 Apparent Dec: +36 27 39
Constellation: Hercules

No more astronomical darkness at this time of year - but a very clear night with good seeing. So I decided for a quick shot at M13. Being a friday night I was very tired and only managed some poor RGB frames after the long L run. There are some tracking issues in the RGB frames, and the red is extremely rough. However, I was impressed that the image went as deep as it did considering the bright skies. Later in the evening I was plagued by moisture. The scope facing side of the coma corrector seemed to mist over a bit - adding to the troubles on the RGB frames. And then I forgot to remove the blue filter when taking the flats, so there was a problem flattening the L layer properly.

Captured in Artemis Capture. Calibrated in ImageViewCA, stacked in maxim. DDP applied to long L layer. LRGB constructed in Photoshop. Some select sharpening in PS.

This image was autoguided using my 400mm focal length refractor and my black and white SC1 webcam.

Current Imaging equipment configuration

Exposure Details :

Coma Corrector 30x150s on 200mm @ F5 with ART285
Coma Corrector B 4x200s on 200mm @ F5 with ART285
Coma Corrector G 4x200s on 200mm @ F5 with ART285
Coma Corrector R 4x200s on 200mm @ F5 with ART285

Curdridge Observatory, Southampton,UK