Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  Solar system body or event
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The long tail of C/2020 F3 (NEOWISE) at 50 mm, 


            Marc Schuh
The long tail of C/2020 F3 (NEOWISE) at 50 mm
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The long tail of C/2020 F3 (NEOWISE) at 50 mm

Technical card

Imaging telescopes or lenses: Sigma 17-50mm f/2.8 EX DC OS HSM

Mounts: Sightron nano.tracker

Software: Pleiades Astrophoto S.L. PinInsight  ·  APT

Dates:July 21, 2020

Frames: 185x20"

Integration: 1.0 hours

Avg. Moon age: 0.82 days

Avg. Moon phase: 0.77%

Basic astrometry details

Astrometry.net job: 3698317

RA center: 9h 59' 35"

DEC center: +53° 9' 21"

Pixel scale: 18.115 arcsec/pixel

Orientation: 54.302 degrees

Field radius: 13.597 degrees

Resolution: 4656x2743

Data source: Traveller


I had a hard time getting a starless image with just rejection without losing a lot of SNR in the comet as well so I decided to take a slightly different approach. Details below.

185x20" = 1,03 h

Star alignment and integration.

Create starmask with starnet++ from the star-aligned integration

Create starless images: binarize starmask, clean up with clone stamp, run DefectMap and SimplexNoise (with starmask) on each frame with containers.

Apply comet registration on the starless images.

Integrate starless images to get starless comet image without streaks, cleanup comet residues with clonestamp.

Use CometAlignment to subtract the comet image from each star aligned frame and integrate the star aligned frames.

Use Pixmath (2*comet+stars) to combine both images.

Crop, TGV+MMT denoise, PCC, SCNR. Extract luminance for later. ArcsinhStretch, Curves

With the extracted L: HT, LHE

Combine the two images with LRGBCombination, Curves, ACDNR and MMT to clean up.


Sky plot

Sky plot


The long tail of C/2020 F3 (NEOWISE) at 50 mm, 


            Marc Schuh

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