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Another cosmic hexagon

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About this observation
Observer
Nick Hewitt
Time of observation
17/09/2018 - 21:39
Object
NGC 7139 in Cepheus
Observing location
Northampton
Equipment
TMB 115mm f7 triplet
EQ8
Trius 814
Hydrogen alpha
Cropped image
Exposure
3 x 600s
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This rather faint planetary nebula (magnitude 13v) shows that Saturn is not the only heavenly body to show hexagonal symmetry. It is annular and the ring structure (~ 78") shows better in H-alpha. I suspect it is a tough target for visual observers with smaller telescopes, but a fun challenge for those blessed with 10" plus!

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