Planetary Nebula in Hydra. Abell 33 is an attractive symmetrical planetary nebula in the constellation Hydra.
It has been called the diamond ring nebula because of the mag 7 star HD83535 that shines on its outer ring.
The star is a foreground star that is not associated with the nebula.
It is fairly strong in OIII and fairly weak with no distinct structure in Ha.
This image adds LRGB for the starfield.
Oh, of course the diffraction spike on the main star is artificial. I apologize. I've never added them before.But how could I not in this instance?
Imaging Camera: QSI540 wsg
Imaging Scope: 9.25" Celestron edge at F/10
Guide Camera: SX Lodestar x 2, PHD2
Mount:Avalon M Uno
Exposure: 10 minute subs: 3 hours 5nm OIII and 4 hours 5nm Ha, all binned X2
5 minute subs: 2 hours Lum, 1.25 hours each RGB, binned x 2
Processing: CCD Stack and PS CS2.
Date: 1/4 -1/5/16 AND 3/6/16
Location: My front driveway. Morristown, NJ
Published in November 2017 Sky and Telescope Magazine. P. 74 (minus the diffraction spikes)