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見出し画像

M8 / Lagoon Nebula

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I went to Tomakomai on this day to capture M8 and M20 in Sagittarius.
As for why Tomakomai... from Sapporo, M8's meridian altitude is at most just over 20 degrees, making it difficult to photograph, so I decided to shoot in Tomakomai to get a little further south.

I set everything up as usual, turned on the SeeStar S30, and when I connected it with the app, a firmware update started...
It's my fault for not checking before leaving, but having a firmware update in the field is really discouraging... and the app even displayed that it failed...
I held down the power button on the SeeStar unit to shut it down and then restarted it, and I was relieved to see that the update had been completed successfully, but...

Setting that aside, here is the raw image taken with the SeeStar. The SeeStar really captures HII regions well.
However, I am concerned that the star images are not sharp, perhaps due to poor tracking.

Here is the processing workflow in PixInsight this time.

  • WBPP with 2x drizzle

    • Astrometric Solution performed at this point

  • SpectrophotometricFluxCalibration

  • MultiscaleGradientCorrection

    • Correcting light pollution with 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 finished image.

I think personal preference comes into play with how to bring out the colors in HII regions, but this time I have kept the colors modest so that the details are visible.
The dark nebula grains visible here and there are also a key point of M8.

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