Comet C/2021 A1 (Leonard) first glance (Richard H)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: 83 UMa · NGC 5294 · The star 83UMa

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Comet C/2021 A1 (Leonard) first glance

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Comet C/2021 A1 (Leonard) first glance

In January this year a new comet was discovered that is approaching the sun and will be seen at its it's brightest on Monday, December 13, 2021. As it approaches the sun it will become brighter and larger. Since it will be very bright from my location later in the year I have worked up an observing plan now and begin imaging the comet to watch its progress throughout the year. Of course, weather permitting from my location.

This a new on-going project i started that will be updated throughout the remainder of this year.

Last night was my first attempt at this comet and was surprised I did have a faint image of the comet in a single frame. Using test shots with various filters based on the sky brightness I used my light pollution Luminance Chroma filter. I did have a cloud roll through as seen in the single frame image. The comet is the very faint object in the center of the frame as annotated.

Specifics:

Image date: Thursday, March 4, 2021

Exposure: 240s Single frame image @ RA: 13:42:29, DEC +54:57:30 at an estimated magnitude of 17.7 (JPL)

Constellation: Ursa Major near the star of Mizar. It will be in Ursa Major for the next few months.

Current distance: 35,002,131 Kilometers or 0.233975 AU

Closest stars: Tyco 3854-9-1 and Tyco 3854-63-1

Equipment:

Scope: Explore Scientific FCD100-CF 127mm f/7.5 with Hotech SCA field flattener

Image camera: QSI 683ws-8 mono

Filter: Chroma Light pollution luminance

Capture software: StarKeeper.it Voyager

Processing:

PixInsight - only calibration and cosmetic correction processes to remove camera hot pixels were applied applied to preserve the faint comet detail. Annotation applied to point out the comet added.

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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	4278540
PixInsight job	Z14BW6Y33LSM1GAJISFA9XKG4GDTYRX6
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	13h42m29s.45
RA (top/left)	13h39m30s.82
RA (top/right)	13h39m45s.90
RA (bottom/right)	13h45m23s.43
RA (bottom/left)	13h45m18s.39

Dec (center)	+54°57′10″.9
Dec (top/left)	+55°29′14″.6
Dec (top/right)	+54°23′53″.9
Dec (bottom/right)	+54°24′50″.6
Dec (bottom/left)	+55°30′13″.3

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Comet C/2021 A1 (Leonard) first glance

Comet C/2021 A1 (Leonard) first glance

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Comet C/2021 A1 (Leonard) first glance

Comet C/2021 A1 (Leonard) first glance

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