Celestial hemisphere:  Southern  ·  Constellation: Sagittarius (Sgr)  ·  Contains:  Solar system body or event
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C/2021 A1 Leonard, 20th December 2021, Igor Chekalin
C/2021 A1 Leonard, 20th December 2021
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C/2021 A1 Leonard, 20th December 2021

Getting plate-solving status, please wait...
C/2021 A1 Leonard, 20th December 2021, Igor Chekalin
C/2021 A1 Leonard, 20th December 2021
Powered byPixInsight

C/2021 A1 Leonard, 20th December 2021

Equipment

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Acquisition details

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Description

Yesterday's Leonard through light haze and Brisbane's light pollution.
Image was taken in the twilight when comet was 24°-13° above the horizon.

133 x 10 sec (LRLGLB sequence, 67x Light, 22x R G and B at gain 100)
Guided by comet's core, no dithering (key point for processing used).

Post-rocessing algorithm:

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:
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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C/2021 A1 Leonard, 20th December 2021, Igor Chekalin