Hemisphere:  Northern  ·  Contains:  Great Cluster in Hercules  ·  M 13  ·  NGC 6205
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M13 - My Little Hercules, 


            Josh Woodward
M13 - My Little Hercules
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M13 - My Little Hercules

Technical card

Imaging telescopes or lenses: Celestron C8 Starbright

Imaging cameras: ZWO ASI 1600MM Cooled Pro

Mounts: Orion (Synta) Atlas EQ-G

Guiding telescopes or lenses: Celestron C8 Starbright

Guiding cameras: ZWO ASI 290MM mini

Focal reducers: Celestron Focal Reducer/Flattener x0.63

Software: PHD2 Guiding  ·  Stellarium  ·  EQMOD  ·  DeekSkyStacker (DSS)  ·  SharpCap  ·  PixInsight 1.8  ·  StellariumScope  ·  Seqence Generator Pro

Filters: ZWO Blue 1.25"  ·  ZWO Green 1.25"  ·  ZWO Red 1.25"

Accessory: OAG  ·  ZWO EFW 8x 1.25"  ·  QHYCCD QHY PoleMaster  ·  Rigel Systems nStep

Dates:Aug. 30, 2019

Frames:ZWO RGB 1.25" Filters: 85x60" (gain: 76.00) -15C bin 1x1

Integration: 1.4 hours

Darks: ~50

Flats: ~20

Flat darks: ~20

Avg. Moon age: 0.08 days

Avg. Moon phase: 0.01%

Bortle Dark-Sky Scale: 5.00

Temperature: 22.00

Basic astrometry details

Astrometry.net job: 2899213

RA center: 16h 41' 48"

DEC center: +36° 30' 57"

Pixel scale: 0.618 arcsec/pixel

Orientation: 84.766 degrees

Field radius: 0.380 degrees

Resolution: 3491x2720

Locations: backyard, Chico, CA, United States

Data source: Backyard


Pixinsight RGB Process

Blink for each channel to find glaringly bad frames

Subframe Selector to weed out high eccentricity and high FWHM frames

BPP for each channel

Star Alignment with red channel as reference

Dynamic Crop on each image to remove stacking artifacts and coma in the corners

Linear Fit with Red as reference

DBE on each registered image

Channel Combination

Background Neutralization

Photometric Color Calibration

TGV Denoise and MMT for noise reduction following Jon Rista technique

Pixinsight Lum Process

Created synthetic Lum from RGB channels

Star alignment to register Lum to RGB

Linear Fit with RGB with Lum as reference

Dynamic Crop based on RGB crop

DBE to remove gradients

Deconvolution to sharpen

TGV Denoise and MMT for noise reduction following Jon Rista technique

Stretch using Histogram Transform

LRGB Combination with saturation slider moved to 25

ACDNR with strong mask to remove “black tail” on left side of histogram

range_mask+star_mask created to protect background from Color Saturation

HDRMT to bring out more detail

Small Morphological Transform to reduce star size

Curves for small overalls saturation boost



Josh Woodward
License: None (All rights reserved)

Sky plot

Sky plot


M13 - My Little Hercules, 


            Josh Woodward