Leonard Comet, 2 January 2022.
Image was taken in the twilight when comet was 27°-17° above the horizon.
96 x 30 sec (LRLGLB sequence, 48x Light, 16x R G and B at gain 100)
Guided by comet's core, no dithering (key point for processing used).
Gif / Video is L sequence animation colored by comet's RGB layer.
Video at good quality is on YouTube (Please watch 4K resolution, compression is killing low contrast moving details)Post-rocessing algorithm is the same as
previous photo:
1) Weighted sum with strong sigma clipping to make comet-only image.
2) Subtract (1) from each raw frame getting stars only image with comet subtraction error artifacts
3) Aligning (2) by stars
4) Stack (3) with strong sigma clipping getting rid of residual comet core artifacts.
5) Combine (1) and (4) via simple addition.
Hardware & Software is the same too:
Tal-250K with F/6 reducer MkII, ASI2600MM camera with ZWO filters, EQ6PRO mount. Balcony in Brisbane.
Software: APT, PHD2, Iris, FITStacker, Photoshop
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