Celestial hemisphere:  Northern  ·  Constellation: Coma Berenices (Com)  ·  Contains:  IC 3571  ·  NGC 4562  ·  NGC 4565  ·  Needle Galaxy  ·  PGC 1760893  ·  PGC 1762205  ·  PGC 2793674  ·  PGC 3096166  ·  PGC 42038
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NGC 4565 Close-up (Reprocessed), Vitali
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NGC 4565 Close-up (Reprocessed)

Getting plate-solving status, please wait...
NGC 4565 Close-up (Reprocessed), Vitali
Powered byPixInsight

NGC 4565 Close-up (Reprocessed)

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Description

It is a summer break for me until August. I do not image because there is no astronomical night here until July, and then the night would be too short. Meanwhile I'm learning how to process the data.

This image is based on the same raw data as the previous Needle:

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However the various processing steps in PixInsight were changed or improved. Different CFA drizzle integration parameters were used. The RGB channels alignment was apparently wrong in the old image.

Also I think that I've finally learned how to apply deconvolution. It looks like I've selected wrong stars (too bright) for the PSF calculation in the past.

I've followed a good advice posted by Jon Rista in a Cloudy Nights thread Keeping Star Color in PixInsight / LRGB to stretch the image.

The most visible difference with the previous image is the color calibration. I've used ColorCalibration process with the galaxy as a white reference instead of PhotometricColorCalibrarion. This is not entirely correct for an edge on galaxy, but it looks to me that it makes more details visible. Revision B uses PhotometricColorCalibration, all other processing steps are exactly the same.

CS and thanks for looking,

Vitali

Comments

Revisions

    NGC 4565 Close-up (Reprocessed), Vitali
    Original
    NGC 4565 Close-up (Reprocessed), Vitali
    B
  • Final
    NGC 4565 Close-up (Reprocessed), Vitali
    C

B

Description: Photometric Color Calibration.

Uploaded: ...

C

Description: Testing my current PixInsight workflow on the old data.

Uploaded: ...

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NGC 4565 Close-up (Reprocessed), Vitali