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Messier Objects

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Messier 13 Globular Cluster in Hercules

M13 Globular Cluster (130mm EOS Ra).jpg

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The globular cluster Messier 13 (M13) in Hercules, with the small galaxy NGC 6207 above it. The very tiny galaxy IC 4617 is just visible between NGC 6207 and M13. M13 is generally considered the finest globular cluster in the northern half the sky (north of the celestial equator).

This is a stack of just two images, each 6 minutes at ISO 800 with the Canon EOS Ra and Astro-Physics EDF 130mm f/6 apo refractor with the 6x7 field flattener. The images were the last two in the sequence of 10, and were the sharpest of the set. Earlier images were softer due to poorer seeing?
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The globular cluster Messier 13 (M13) in Hercules, with the small galaxy NGC 6207 above it. The very tiny galaxy IC 4617 is just visible between NGC 6207 and M13. M13 is generally considered the finest globular cluster in the northern half the sky (north of the celestial equator).<br /> <br /> This is a stack of just two images, each 6 minutes at ISO 800 with the Canon EOS Ra and Astro-Physics EDF 130mm f/6 apo refractor with the 6x7 field flattener. The images were the last two in the sequence of 10, and were the sharpest of the set. Earlier images were softer due to poorer seeing?