C2021 A1 (Leonard) 2021-12-04 (BillyBoyBoy)

Celestial hemisphere: Northern · Constellation: Boötes (Boo) · Contains: Solar system body or event

C2021 A1 (Leonard) 2021-12-04

Comet C/2021 A1, imaged on December 4, 2021 at 5AM. It was after enduring my first rainstorm while imaging (I was prepared, but surprised that the passing clouds came with a bath), and the effort through the earlier part of the night on another object was a bust due to high clouds I did not see until I checked my images the day after. However, my pre-dawn plan to catch this comet was successful with clear skies and a beautiful lightning show in the distance. I was surprised how the tail revealed itself to extend off the sensor, even though I had framed the comet's core near the opposite corner. I love how, in the image, that tail reveals itself more with averted vision, just like in the eyepiece!

Little did I know that 24 hours before, the comet flew almost right in front of M3. I imaged the morning before and the morning after that flyby, so another lesson in planning and paying attention to such events! Fast moving comets can be a lot to keep up with.

Please note: The following tables are updated every 24 hours.

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
Top picks
Top pick nominations

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
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

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
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
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	5317104
PixInsight job	O57Z0WO8SRWSJJ5AF4ZB6HIPK2MLZJOP
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	13h56m38s.851
RA (top/left)	13h52m51s.258
RA (top/right)	13h53m31s.754
RA (bottom/right)	14h00m21s.599
RA (bottom/left)	13h59m50s.220

Dec (center)	+27°20′59″.99
Dec (top/left)	+28°28′04″.20
Dec (top/right)	+26°08′26″.22
Dec (bottom/right)	+26°13′37″.44
Dec (bottom/left)	+28°33′19″.50

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C2021 A1 (Leonard) 2021-12-04

C2021 A1 (Leonard) 2021-12-04

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C2021 A1 (Leonard) 2021-12-04

C2021 A1 (Leonard) 2021-12-04

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