Turtle Nebula (NGC 6210)
The Turtle Nebula is a planetary nebula located approximately 5,400 light-years away in the northern constellation Hercules. It has an apparent magnitude of 9.30. It… Read More »Turtle Nebula (NGC 6210)
NGC 6210
The Keystone
The Keystone is an asterism formed by four relatively bright stars in the constellation Hercules: Pi, Eta, Zeta and Epsilon Herculis. The trapezoid-shaped pattern makes it easy for observers to identify the constellation and to find several well-known deep sky objects. On a clear night, the Keystone can be seen between the bright Vega, the brightest star in Lyra, and the stars of Corona Borealis, the Northern Crown. The asterism represents Hercules’ torso.
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