Great Hercules Cluster, M13 (Jason Tackett)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: Great Cluster in Hercules · M 13 · NGC 6205 · NGC 6207

Great Hercules Cluster, M13, Jason Tackett

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Great Hercules Cluster, M13

M13 is a large globular cluster in the constellation Hercules. This is another image from the 2014 Spring East Coast Star Party.

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Processing Workflow (PixInsight)

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Pre-processing

1. Calibrate light frames using darks, bias, flats

2. Integrate using sigma clipping rejection.

Post-processing

1. Initial crop (Dynamic crop)

2. Reduce background gradient and neutralize background (DynamicBackgroundExtraction, subtract)

3. Neutralize background (BackgroundNeutralization)

4. Set white balance (ColorCalibration; use entire image since it is all stars)

5. Non-linear stretch (MaskedStretch script; target median background 0.15)

6. Set luminance coefficients to 0.333333 for RGB channels (RGBWorkingSpace).

7. Reduce background luminance noise (ACDNR to luminance with luminance mask)

8. Reduce background chrominance noise (ACDNR to chrominance with luminance mask)

9. Reduce green (SCNR)

10. Lower background brightness (CurvesTransformation)

11. Increase color saturation (CurvesTransformation w/ star mask selecting stars)

12. Cosmetic correction to a few spurious pixels in some stars that were over saturated (desaturation of the specific color with ColorSaturation using mask to select offending stars)

13. Lower background median brightness to 0.1 (CurvesTransformation)

14. Final Crop (DynamicCrop)

15. Set ICC profile to sRGB for web publishing (ICCProfileTransformation).

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	Basic success
Started	...
Astrometry.net job	361059
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Great Hercules Cluster, M13

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Image Index:

Contribution Index (beta):

Great Hercules Cluster, M13

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

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