m 57

 

M57 (Ring Nebula)

is the "classic planetary" and is located in the constellation Lyra.   Messier added M57 to his list in 1779.  M57 is located at a distance of 1500 ly.  The central star has a surface temperature of 100,000 degrees K and is thousands of times denser than the sun

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m57lrgb.jpg (37452 bytes)

Smaller image
Foresthill, California
July 1999
hPJ400, stack of two 15 minute exposures.
FS-128 @ f/24 (ag)
Larger image
Penryn, California
July 2002
ST-10xme LRGB 15-12-9-12 minutes
FS-128 @f/16 (ag)