Celestial hemisphere:  Northern  ·  Constellation: Gemini (Gem)  ·  Contains:  13 Gem)  ·  Calx (μ Gem  ·  IC 444  ·  LBN 840  ·  LBN 845  ·  LDN 1565  ·  LDN 1566  ·  LDN 1567  ·  Sh2-249  ·  Tejat Posterior  ·  The star 12 Gem  ·  The star Tejat  ·  VdB75
Dark Seahorse amongst the Jellyfish Exhaust (HOO), Jonathan W MacCollum
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Dark Seahorse amongst the Jellyfish Exhaust (HOO)

Dark Seahorse amongst the Jellyfish Exhaust (HOO), Jonathan W MacCollum
Powered byPixInsight

Dark Seahorse amongst the Jellyfish Exhaust (HOO)

Equipment

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Acquisition details

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Description

The Dark Seahorse is a dark feature in the exhaust of the Jellyfish nebula (out of frame.)
This is a work-in-progress HOO edit of this data set and would like to add more data to this image, but the ghost reflections caused by Tejat Posterior in the wynne corrector are causing me to favor other targets, so I'm publishing this one as-is, and may revisit it in the future if the weather cooperates.

Processing Notes:
* DBE
* Image Solver
* Spectrophotometric Color Calibration in Narrowband Mode
* Noise Reduction: DeepSNR a separate copy at 100%, create mask with result, merge the noise reduced copy into the original with the mask applied
* Sharpening: BlurX a separate copy with a reduced amount, use the previous mask and merge the BlurX version into the original with the mask applied
* Create a separate starless and stars only image
* Process the stars image with Histogram Transformation to stretch them nonlinear
* Process the starless image with Histogram Transformation and then GHS to nonlinear
* Increase the contrast of the starless image with a mask that has had HDR applied to it, and apply large scale LHE to the stretched starless image affecting the small scale highlights accented in the mask
* Increase the saturation of the starless image to restore the color that turned pink during the local histogram equalization step
* Export the starless image to affinity and, using the Inpaint brush, remove the tswynne ghost halos in the upper edge on the right near vdb75... use the difference from the original back in pixelmath to create a mask that models the halos.  Reduce the original starless image using the halo mask without removing the data entirely. (The reflections are in the data, so I just want to reduce them not eliminate them entirely.)
* Combine the starless and stars image using a reverse midpoint transformation addition ``mtf(.005,mtf(.995,starless)+mtf(.995,stars))``

Comments

Sky plot

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Histogram

Dark Seahorse amongst the Jellyfish Exhaust (HOO), Jonathan W MacCollum