Globular Cluster M13

Under ideal conditions this magnificent globular cluster can be glimpsed with the naked eye and is easily found with binoculars, appearing like a hazy star half the apparent width of the Moon. It lies on one side of the Keystone, about one-third of the way from Eta (h) to Zeta (Z) Herculis. M13 is 25,000 light-years away.

AlpHA (a) HERcULIS (RASALGETHI) 2 1 5 A red giant that pulsates erratically, fluctuating between 3rd and 4th magnitudes. A small telescope reveals a 5th-magnitude blue-green companion.

RHo (p) herculis 5 A double star of 5th and 6th magnitudes, divisible through small telescopes with high magnification.

M13 2 H A spectacular globular cluster, the finest in northern skies, containing hundreds of thousands of stars.

M92 5 A 7th-magnitude globular cluster. Smaller and fainter than M13, it can be mistaken for an ordinary star when seen through binoculars, but a small telescope quickly reveals its true nature.

Lyra Lyrae (Lyr)

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