Comet NEOWISE over Ft. Griffin State Historic Site, TX (Andrew Klinger)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: Solar system body or event

Comet NEOWISE over Ft. Griffin State Historic Site, TX, Andrew Klinger

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Comet NEOWISE over Ft. Griffin State Historic Site, TX

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Comet NEOWISE over Ft. Griffin State Historic Site, TX

While my telescope was imaging the comet, I threw my camera and tripod down to capture just how enormous NEOWISE appears in the sky. To the unaided eye in dark skies you could see the majority of the tail photographed here with averted vision. In binoculars it was just as good as a photo.

You'll notice two tails. The blue one is the ion tail, caused by the sun's radiation electrically charging the gases. The ion tail extends further than my frame could capture, truly incredible. The larger more diffuse tail is the dust tail, where particles are released as the sun vaporizes the comet.

Equipment:

Lens: Rokinon 24mm f/1.4 (stopped to f/2.8)

Static tripod

Imaging camera: Canon t3i

Software:

PixInsight

Photoshop

Acquisition:

Location: Ft. Griffin State Historic Site, TX (Bortle 2)

Dates: 7/19/2020

ISO1600

171x10"

Total integration time: 28.5mins

64 darks

200 bias

Processing:

Not going to list out every step like I usually do because it was chaotic. Basically I made a stacked image aligned by the stars, and a separated stacked image aligned by the comet. I processed the comet aligned image, removed the stars, and added in the stars from the star aligned image. The foreground was a stack of a few frames without any alignment and then blended into the processed image to hide the trailed tree-line.

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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	3693444
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Comet NEOWISE over Ft. Griffin State Historic Site, TX

Comet NEOWISE over Ft. Griffin State Historic Site, TX

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Contribution Index (beta):

Comet NEOWISE over Ft. Griffin State Historic Site, TX

Comet NEOWISE over Ft. Griffin State Historic Site, TX

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