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見出し画像

M20/Trifid Nebula and M21

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After shooting M8, I started shooting M20, which is right next to it to the north.

↓ Click here for the M8 article

First, here is the straight-out-of-camera photo.
Although the Trifid Nebula is clearly captured, the star images are just terrible...
(M21 in the upper left is especially bad...)
It wasn't this bad before, but the star images for M8 were also poor, so I wonder if my polar alignment wasn't done correctly...

Here is the processing workflow in PixInsight this time.

  • WBPP with 1x drizzle

    • Astrometric Solution already performed at this point

  • SpectrophotometricFluxCalibration

  • MultiscaleGradientCorrection

    • Gradient correction using these two tools

  • Color calibration with SPCC

  • Correcting stars to be smaller with BXT

  • Noise reduction with NXT

  • Separating into starless image and star mask with SXT

  • Stretching each with GHS

  • Recombining with CombineImages

And here is the final image. It looks good enough now.

Not only is the HII region on the south side of M20 visible, but the blue color of the reflection nebula on the north side is also coming through.
Also, M21 is captured in a way that highlights it as an open cluster, so I think it turned out quite well.

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