The Spectral Comet (Edoardo Luca Radice (Astroedo))

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

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The Spectral Comet

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The Spectral Comet

This winter, in addition to a bit of cold, is bringing us a surprise: Comet C / 2021 A1 (Leonard).

It could even reach the Naked eye visibility threshold in the next few days (obviously under dark skies, certainly not in our twilight cities).

Therefore all of us amateur astronomers and astrophotographers are in fibrillation: it does not often happen to be able to see and photograph such bright comets.

So why not participate in this CCH? (Collective Cometary Hysteria).

Photographing from the city, however, the quality of my images could never reach the levels of my noble colleagues taking pictures under dark skies and here is the idea, a little bit odd but effective:

Why not take advantage of the comet's motion to obtain something original?

And here it is at my "Spectral Comet": obviously this is not a real spectrum: as you can see the stars are perfectly normal.
Here the dispersion of cometary light occurred thanks to its movement.
Shooting objects with a black and white camera, the only way to reconstruct the colors is taking three series of images with Red, Green and Blue filters, but while the stars remain still, and therefore their images in the three colors overlap creating a normal RGB image.
But the comet moves and therefore its images appear not to overlap creating a colored track: red at the beginning, then, when the filter changes, it becomes green and finally, at the last filter change it becomes blue.

So this is, in fact, an extremely raw spectra of our Christmas comet which, we hope, will give us a good show in the next few days.

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Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
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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.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
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Star trails
Northern lights
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Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
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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	5280170
PixInsight job	Z232BIDUR3GE9F71LJ45FQP3EAEH71CW
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	13h21m30s.24
RA (top/left)	13h25m11s.73
RA (top/right)	13h25m09s.36
RA (bottom/right)	13h17m45s.15
RA (bottom/left)	13h17m54s.93

Dec (center)	+30°12′44″.2
Dec (top/left)	+29°19′34″.2
Dec (top/right)	+31°06′32″.2
Dec (bottom/right)	+31°05′25″.3
Dec (bottom/left)	+29°18′27″.9

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The Spectral Comet

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