M 57

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Description: M 57, The Ring Nebula, was created thousands of years ago when the old, hot central star blew off its outer layers. The star produces strong ultraviolet radiation which is causing the gases in the nebula to fluoresce.
Constellation: Lyra
Distance: 2 thousand light years
Apparent Size: 1.2'
Date: 5 march and 20 june 2005
Equipment: 12" RC @ f/9, ST10XME
Exposure: (HaR)GB

Ha: 90 minutes at 6nm

RGB: 40-40-45 minutes (2 x 2)