M13 - the Great Globular Cluster in Hercules (mhtandy)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: HD150293 · HD150462 · HD150510 · HD150566 · HD150679 · HD150998 · Hercules Globular Cluster · IC 4616 · IC 4617 · M 13 · NGC 6197 · NGC 6205 · NGC 6207

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M13 - the Great Globular Cluster in Hercules

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M13 - the Great Globular Cluster in Hercules

Original
B
C
Final
D

B

Description: 2 additional curve adjustments and unsharp mask

Uploaded: ...

C

Description: Started over, after noticing some vignetting (used GradientXTerminator). Overall less processing than the original version.

Uploaded: ...

D

Description: Added an additional night of imaging, and since I had a different exposure time (60s) the 2nd night, I used "Entropy Weighted Average (HDR)" in DSS during stacking. This seems to be the preferred method when stacking different exposure times. Not sure what effect the different ISO values had, though :).
The final stacked image was surprisingly clear and sharp and needed less processing than night 1.
Only downside: choosing the "Entropy" method excludes the "Kappa-Sigma Clipping" option, so random satellites and meteor trails can show up (caught one on the right side of M13).

Uploaded: ...

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	Distinct awarded users	Total awarded images
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Distribution of subject types

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	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
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Star trails
Northern lights
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	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
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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.
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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	4595543
PixInsight job	AJGK81L40YB6DM7243NIHDMHTXX8BZQD
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	16h41m44s.78
RA (top/left)	16h38m19s.25
RA (top/right)	16h37m52s.19
RA (bottom/right)	16h45m04s.23
RA (bottom/left)	16h45m44s.68

Dec (center)	+36°26′31″.7
Dec (top/left)	+37°33′45″.7
Dec (top/right)	+35°24′14″.1
Dec (bottom/right)	+35°19′29″.10
Dec (bottom/left)	+37°29′02″.5

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M13 - the Great Globular Cluster in Hercules

M13 - the Great Globular Cluster in Hercules

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Image Index:

Contribution Index (beta):

M13 - the Great Globular Cluster in Hercules

M13 - the Great Globular Cluster in Hercules

Equipment

Acquisition details

Comments

Revisions

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C

D

Sky plot

Histogram

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