M13 – Hercules Globular Cluster


Herculas Globular Cluster

Brightest star cluster in the northern sky


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.” Of course, M13 is now less modestly recognized as the Great Globular Cluster in Hercules, one of the brightest globular star clusters in the northern sky. Telescopic views reveal the spectacular cluster’s hundreds of thousands of stars. At a distance of 25,000 light-years, the cluster stars crowd into a region 150 light-years in diameter. 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. Along with the cluster’s dense core, the outer reaches of M13 are highlighted in this sharp color image. The cluster’s evolved red and blue giant stars show up in yellowish and blue tints.

The Great Globular Cluster in Hercules


Technical card


Imaging telescopeExplore Scientific ED 102 APO FCD1
Imaging cameraZWO ASI 1600MM PRO
Mount SkyWatcher HEQ5 Pro
GuidingGuidescope 240mm, ZWO ASI 120MM
FilterZWO Lum 1.25″,  ZWO Red 1.25″,  ZWO Green 1.25″,  ZWO Blue 1.25″
AccessoriesTS PHOTOLINE x0.80 Reducer/Korrektor
Integration4.2 hours, Lum: 166×30″, Red: 39×90″, Green: 37×90″, Blue: 36×90″,
Dates of recordingJuly 9, 2018 ,  July 13, 2018 ,  July 16, 2018


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