C/2021 A1 (Leonard) (Euripides)

Celestial hemisphere: Northern · Constellation: Canes Venatici (CVn) · Contains: Solar system body or event

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C/2021 A1 (Leonard)

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C/2021 A1 (Leonard)

So here is my effort for 2021 viral comet, mr Leonard and the last ready to publish image for this year.

300 x 20" subs. Next time I'll definitely add a time gab between subs, for example 1minute, cause I think it will help the rejection algorithm.

After registering all the subs as usual I've created 2 Master Lights:

1. Image Integration to keep stars steady (1st)
2. Comet Alignment to keep the comet nice and clear (2nd)

After stretching to non linear state, I've used StarXTerminator on both images, keeping the stars from the 1st image.

The problem here was that in the 2nd image there were a lot of remaining residuals not cleaned up from the rejection algorithm.

After many, many trials and errors in PixInsight with PixelMath, I finally decided to go with PhotoShop. I've loaded both starless images together and with a brush and a mask I revealed the comet (2nd) on the good sky (1st).

Finally I've used PixelMath to combine PS output with the stars.

So, farewell mr Leonard.

Samyang 135 f/2
Camera Lens Astrophotography
Greek astrophotographers
Astrophotography in Greece

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	Distinct awarded users	Total awarded images
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Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
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Backyard
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Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced success
Started	...
Astrometry.net job	5355596
PixInsight job	PNWQZDHZ5VIFDT07VNDHQFXUQRC5HDH9
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	13h29m40s.78
RA (top/left)	13h23m39s.49
RA (top/right)	13h23m06s.88
RA (bottom/right)	13h35m31s.92
RA (bottom/left)	13h36m25s.47

Dec (center)	+29°40′13″.1
Dec (top/left)	+31°09′44″.3
Dec (top/right)	+28°18′30″.0
Dec (bottom/right)	+28°09′33″.8
Dec (bottom/left)	+31°00′37″.6

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C/2021 A1 (Leonard)

C/2021 A1 (Leonard)

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C/2021 A1 (Leonard)

C/2021 A1 (Leonard)

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