M13, Hercules

June, 2021

Imaging: TS80 apo, ZWO ASI533 (gain 100), Baader Neodymium
Subs: 284x60 (4.7h), darks, flats, and darkflats
Software: NINA, Phd2, PixInsight

(Additional notes below)



The Great Hercules Globular cluster, Messier 13. This is the first image with my new ZWO ASI533MC astrocamera. This camera is a special purpose, cooled OSC. For deep space photography, the image is so dim that sensor noise is significant, so the ASI533 includes a TEC cooler that can keep the sensor at 0°C. This significantly reduces the noise in the image.

Hercules is comprised of several hundred thousand stars. It is the largest globular cluster viewable in the northern hemisphere at about 145ly in diameter. In dark skies, it might be just barely visible to the naked eye. Compared to our sun and its neighboring stars, the stars in the Hercules cluster are more than a hundred times denser (and sometimes collide with each other).