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NGC 7293 - Helix Nebula 
Penryn, California
August, 2008
M 250 @ f9.3  (ag, ST-4)
ST-10XME LRGB - 5  Minutes each

Burnham describes NGC 7293 as "..a spherical shell of very tenuous gas, illuminated by a tiny but exceedingly hot central star of 13th magnitude....the estimated diameter (of the central star) is about  2% that of our Sun, but the temperature is over 100,000 degree K."