The Great Globular Cluster in Hercules (Aleix Roig)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: Hercules Globular Cluster · IC 4617 · M 13 · NGC 6205 · NGC 6207

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The Great Globular Cluster in Hercules

Link: https://flic.kr/p/2kRjcxo

Link to TIFF/FITS: https://flic.kr/p/2kRjcxo

Powered byPixInsight

The Great Globular Cluster in Hercules

Link: https://flic.kr/p/2kRjcxo

Link to TIFF/FITS: https://flic.kr/p/2kRjcxo

M13, the Great Globular Cluster in Hercules, is an amazing spherical collection of stars tightly bound by gravity, which gives it this great density of stars. Several hundred thousand stars can be found in one of the most impressive clusters as seen from Earth.

Located some 22,000 light-years away from us in the Hercules constellation, this globular cluster is about 145 light-years in diameter.

Even though this object is quite far away from the Milky Way galactic plane, I captured more than 15h of images using the Ha filter in order to see if I was able to capture some faint and elusive Galactic Cirri. I did not succeed on this search, discarting the 15h55min Ha image. I finally stuck with a classical LRGB image.

Image details:

Luminance: 70x120"

RGB: 35x120"

All images at 120 Gain -15ºC bin2

Calibrated with 50 flats, 50 darks and 50 bias

Total exposure: 5h50'

Image resolution: 2.12"/pixel

Average darkness: 20,80 mag/arcsec2

Equipment:

FSQ85ED telescope

Mesu200 mount

ASI294MM Pro camera with ZWO EFW 8 pos

Guiding with ASI174MC and ZWO OAG

Baader filters

Software:

SGP, PHD2, APP, PIX.

Aleix Roig - Prades, Catalonia, Spain. April 2021.

Cloudy Nights

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	Distinct awarded users	Total awarded images
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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
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	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
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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	Advanced success
Started	...
Astrometry.net job	4379691
PixInsight job	4YGP9DVMIR1N3YCLXDZOFUARL7Y0O86M
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	16h41m41s.57
RA (top/left)	16h43m11s.33
RA (top/right)	16h43m30s.94
RA (bottom/right)	16h40m10s.75
RA (bottom/left)	16h39m53s.40

Dec (center)	+36°27′44″.9
Dec (top/left)	+35°58′42″.3
Dec (top/right)	+36°54′02″.0
Dec (bottom/right)	+36°56′43″.3
Dec (bottom/left)	+36°01′25″.9

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The Great Globular Cluster in Hercules

The Great Globular Cluster in Hercules

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The Great Globular Cluster in Hercules

The Great Globular Cluster in Hercules

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