Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree
Contains:  M 13, Great Cluster in Hercules, NGC 6205
Getting plate-solving status, please wait...


            Joshua Judkins


Technical card

Resolution: 3856x2781

Dates:July 20, 2018

ZWO B 1.25": 10x5" (gain: 195.00) -20C bin 1x1
ZWO G 1.25": 13x5" (gain: 195.00) -20C bin 1x1
ZWO Lum 1.25": 8x5" (gain: 195.00) -20C bin 1x1
ZWO R 1.25": 14x5" (gain: 195.00) -20C bin 1x1

Integration: 0.1 hours

Darks: ~20

Flats: ~20

Avg. Moon age: 8.05 days

Avg. Moon phase: 57.04%

Bortle Dark-Sky Scale: 7.00 job: 2163350

RA center: 250.423 degrees

DEC center: 36.458 degrees

Pixel scale: 0.328 arcsec/pixel

Orientation: 0.462 degrees

Field radius: 0.216 degrees

Data source: Backyard


Messier 13, or the Great Globular Cluster in Hercules. My previous best image prior to my new set up was just a tiny fuzzy blob with very little resolution. Suffice it to say, I'm incredibly happy to have taken this image!

If you live in a dark location, you can actually see this object with your naked eye as a fuzzy patch near the right shoulder of the constellation Hercules. The cluster contains several hundred thousand stars in a densely packed region about 22,000 light years from Earth. From edge to edge this cluster is 145 light years in a diameter and is actually in orbit around the super massive black hole at the center of our own galaxy, the Milky Way.

Acquisition details: Meade LX600 12" telescope with wedge, ZWO ASI 1600MM-Cool camera. Luminance channel 8x5s, Red Channel 14x5s, Green Channel 13x5s, and Blue channel 10x5s for a total integrated exposure time of 3.75 minutes. Stacked in DSS and Nebulosity4, with some final processing and compositing in Photoshop CS6.



Joshua Judkins
License: None (All rights reserved)

Sky plot

Sky plot




            Joshua Judkins