AR 00h 13m 00s
DEC +72° 31' 20"
Temperature 13,5°C 26% RH
Bortle 3/9 SQM 21,3 Visual magnitude 6,2
Seeing 4/5 Transparency 4/5
Distance 3.500 Ly
William Herschel on November 25, 1788
The last day with my scope of 16" towards NGC 40. The changes are very different from my old 10". In the search at 145x the central, bright, planetary star with an oval shape appears and what I call the shell on each side.
Interchanging several eyepieces changing with both NPB and OIII filters, I concluded that I was not going to use any, some small detail as brightness decrease in the lower part of the central star, in addition to a small outline marked on the outside of the shell, but it was not relevant, I decide to use only 400x magnification.
It shows a decrease in brightness inside as well as before, on its right and left, the latter being more significant. The lower shell is much brighter and more profiled, with a more defined outline, where right in the center it has a brighter clump. A star appears near the edge of the lower left shell.
The upper shell has something less bright and is somewhat less profiled but it is completely visible, any detail mentioned above with avoided vision intensifies much more.
It is one of those objects that the opening makes a very obvious significant change. How about your review with this object in different scope ?