Celestial hemisphere:  Northern  ·  Constellation: Pegasus (Peg)  ·  Contains:  HD204571  ·  HD204712  ·  HD204862  ·  M 15  ·  NGC 7078  ·  PK065-27.1
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M15/NGC 7078, Rob Foster
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M15/NGC 7078

Revision title: SPCC and BXT Revision

Getting plate-solving status, please wait...
M15/NGC 7078, Rob Foster
Powered byPixInsight

M15/NGC 7078

Revision title: SPCC and BXT Revision

Equipment

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Acquisition details

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Description

With clear skies and a full moon, attention turns to globular clusters and other suitable bright targets.  In an effort to reduce overexposing/saturating star cores, I shot two nights of M15 at an iso of 200 and 30 seconds and managed to avoid saturating the cores except in a larger (wide-field) image that was cropped down to this image.

Comments

Revisions

  • M15/NGC 7078, Rob Foster
    Original
  • M15/NGC 7078, Rob Foster
    B
  • Final
    M15/NGC 7078, Rob Foster
    C

B

Title: M15, Revised with improved cores

Description: After reading about the problem with core dropout is some globular clusters following drizzle integration, I revised the workflow using a masterdark for cosmetic correction instead of auto, and set the the Percentile High to 0.00 in Image Integration settings, but otherwise did not touch the DI settings. These two steps eliminated the "donut" stars seen in the earlier version when select saturated cores were dark from selective rejection; not sure which was actually responsible for the improvement. I think I over-sharpened the deconvolution slightly. Another difference was the method of stretch; I used Generalized Hyperbolic Strech and avoided all of the purple and blown out cores that detracted from previous stretches; for the first time in a while there was no need for HSV Repair or ColorClip script to rescue the cores. I think the GHS script is an absolute winner, though I think I like the iterative nature of the script better than the process.

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C

Title: SPCC and BXT Revision

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Sky plot

Sky plot

Histogram

M15/NGC 7078, Rob Foster