reviewed Cat's Eye (Halifax)

BGO robot made the images shot of NGC 6543 available. The Cat's Eye Nebula in Draco. I was very curious the results, now including a new filter. And also to compare and my all-colour DSLR shot...

Quickly converted, with FITS Liberator, the H-alpha, red, green, and blue FITS images. All subs were 60 seconds. North is down and east is right for all.

There's something strange going on in the hydrogen α. The fuzzy bits left and right are interesting but the whole image looks grainy. The planetary nebula itself appears blown out. But there are streaks or trails?! It almost looks like rain! What's going on? 10 subexposures.

The red... Almond shape. 5 subexposures.

Hey, there's an object off to the right! A little streak. Bright core. A bit of structure? A barred spiral perhaps to two prominent arms? Perhaps an edge-on galaxy? [ed: That's NGC 6552.]

And there's a very small oval fuzzy due left (west) of the PN. [ed: LEDA 2689421.]

And the tiny round object, near the bottom-left, between stars J175657.6+664410 and GSC 04212-1313 is not star like. A distant galaxy? [ed: LEDA 2690715.]

The green... There's something immediately left of the nebula. Also, I can see a faint diaphanous large ring around the central nebula. With a radius of about 2 to 3 arcminutes. I think! 5 subexposures.

The blue... There's still something left of the nebula. The ring is fainter. 5 subexposures.

They all look blown out. Considered a redo. To "fix" the Hα. I will try setting the exposures half the current.