Comet C/2021 A1 Leonard (AstroKeno03)

Celestial hemisphere: Southern · Constellation: Microscopium (Mic)

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Comet C/2021 A1 Leonard

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Comet C/2021 A1 Leonard

C/2021 A1 (Leonard) is an inbound long period comet discovered by G. J. Leonard at the Mount Lemmon Observatory on 3 January 2021 (a year before perihelion) when the comet was 5 AU (750 million km) from the Sun. This was the first comet discovered in 2021 and it has a retrograde orbit. On 12 December 2021 the comet was 0.233 AU (34.9 million km) from Earth and on 18 December 2021 it was 0.028 AU (4.2 million km) from Venus. It will make its closest approach to the Sun on 3 January 2022. On 10 October the comet showed a short but dense dust tail. In early December the comet had an apparent magnitude (coma+nucleus) of around 6. The first reports of naked eye observations by experienced observers started coming in on 5 December 2021. Much like observing Messier 33, the low surface brightness of the comet can make it difficult to observe near urban areas. As of 22 December 2021, the comet is around apparent magnitude 4, making it a good binocular comet for the Southern hemisphere.

INDI Users

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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
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	Basic success
Started	...
Astrometry.net job	5348899
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Comet C/2021 A1 Leonard

Comet C/2021 A1 Leonard

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Image Index:

Contribution Index (beta):

Comet C/2021 A1 Leonard

Comet C/2021 A1 Leonard

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Description

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