Celestial hemisphere:  Northern  ·  Constellation: Hercules (Her)  ·  Contains:  Great Cluster in Hercules  ·  M 13  ·  NGC 6205
Getting plate-solving status, please wait...
M13, Great Hercules Globular Cluster, 26 Jun 2013, David Dearden
M13, Great Hercules Globular Cluster, 26 Jun 2013
Powered byPixInsight

M13, Great Hercules Globular Cluster, 26 Jun 2013

Equipment

Loading...

Acquisition details

Loading...

Description

Had hoped to try the Cat's Paw Nebula tonight, but I don't think it will ever get high enough in my sky to be doable (actually it might be but only for a couple of hours per night). So I decided to shoot M13 instead and test my new method of mounting my guide scope. M13 is among the easiest things to find with a Telrad, and it is bright so it is easy to see. I've reduced my subframe exposures to only 120 s to try and avoid blowing out the core; I'll take as many subs as I can. It is quite breezy tonight so guiding is a bit of a battle. Chiller at 2.5 A, 19 °C (it is hot tonight!). Conditions were not really good enough for this imaging scale, but this is what I got.

Date: 26 Jun 2013

Subject: M13, Great Hercules Globular Cluster

Scope: AT8IN + HPS Coma Corrector

Filter: None

Mount: CG-5 (Synta motors)

Guiding: 9x50 Finder/Guider + DSI Ic + PHD 1.14.2

Camera: DSI IIc (chiller at ~2.5 A, T = 19-20 °C)

Acquisition: Nebulosity 3.1.6, no dither

Exposure: 37x120 s

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

Processing: StarTools 1.3 Crop; Wipe:Color & Brightness; Develop 96.77%; Contrast; HDRptimize; Sharpen; Deconvolute: 3.0 pix; Track; Color:Bottom 2.0, Top Full, Sat 900%; Life:Moderate. To another layer, StarTools 1.3 Crop; Wipe:Color & Brightness; Auto Develop; Contrast; HDR:Reveal Core; Sharpen; Color:Bottom 2.0, Top Full, Sat 900%; Repair:Warp (masked stars); Life:Moderate. CS6+Astronomy Tools Gaussian blurred (20 pix) layer mask combine the “Reveal” layer for the core with the “Optimize” layer for everything else; deep space noise reduction; space noise reduction; less crunchy more fuzzy; AstroFrame.

Comments

Revisions

  • M13, Great Hercules Globular Cluster, 26 Jun 2013, David Dearden
    Original
  • Final
    M13, Great Hercules Globular Cluster, 26 Jun 2013, David Dearden
    B

Sky plot

Sky plot

Histogram

M13, Great Hercules Globular Cluster, 26 Jun 2013, David Dearden