M12 (Charles Harris)

Celestial hemisphere: Southern · Constellation: Ophiuchus (Oph) · Contains: M 12 · NGC 6218

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M12

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M12

Done with cooled flats this time and the difference is apparent in the background when compared with M3 effort. Was able to work with the background more and no striations from bias present. Focusing challenges were biggest issue (lum). Interchanged ES and Hotech field flattener with no difference in star roundness. Confirmed that 19000 to 22000 mean background is an extremely reliable number for achieving good flats. Refractor needs to be checked for collimation. RGB subs were pretty tight focus. Given brightness of this target imaged at f7, maybe could have gone with slightly shorter subs. Fairly pleased with effort. Learned about pixel math dark pixel corrections formula, sharpening with extracted layers/binarizing/MLT.

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Description: Uploading final again. I think something batty happened with the site since I already did this yesterday...

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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.

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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	2125811
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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M12

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Image Index:

Contribution Index (beta):

M12

M12

Equipment

Acquisition details

Description

Comments

Revisions

B

Sky plot

Histogram

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