ALTAIR ASTRO RC 250TT
QHY9S MONO CCD
LRGB EACH AT 3 X 300s
IOPTRON CEM 60 MOUNT
In 1716, English astronomer Edmond Halley noted, “This is but a little Patch, but it shews itself to the naked Eye, when the Sky is serene and the Moon absent.”
M13 is now modestly recognized as the Great Globular Cluster in Hercules, one of the brightest globular star clusters in the northern sky.
At a distance of 25,000 light-years, the cluster stars crowd into a region 150 light-years in diameter, but approaching the cluster core upwards of 100 stars could be contained in a cube just 3 light-years on a side. For comparison, the closest star to the Sun is over 4 light-years away
IC 4617 also captured on the far lower left of the image.
when it reaches our eyes, it is 25,000 years old, having left the cluster during the Earth’s last great Ice Age. The cluster contains an estimated 300,000 stars, spans 145 light years, and incredibly, is thought to be nearly 14 billion years old – as old as the Universe!