Abell 33 Planetary Nebula in Hydra

Abell 33 Planetary Nebula in Hydra

Diamond Ring Nebula

Constellation: Hydra
Ra: 09h 39m 08s
Dec: -2d 47m 36s
Distance: 2700 light years
Image Size: 25' x 25'
North: Up, East Left



Abell 33 is a spherical planetary nebula in the southern constellation of Hydra about 2,700 light years distant.  It has been described as a diamond ring due to the bright star (HD83535) at its rim.  This star is not part of the nebula, being in front of it in our line of sight. The inner structure has similar dark and light features as the northern Owl planetary nebula, M97.  The outer envelope is a distinct rim.  The primary color is due to strong emission of oxygen (OIII).  The hydrogen (H-a) signal is much weaker.

The image above is 25 x 25 arcminutes and Abell 33 is about 4.5′ in diameter.  Nebular structure is defined by narrowband filters where OIII was color-mapped to blue-green and H-a to red/magenta. Star colors were produced by RGB filters.  North is up and east is to the left.

Exposure: 14.25 hrs Total:6.5 hrs OIII, 6 hrs H-a, 1.75 hrs RGB
Telescope: PlaneWave CDK20 0.5 m f/6.8
Mount: PlaneWave Ascension 200h
Oag: Astrodon MonsterMOAG
Acquisition: ACP8-Expert
Calibration: CCDStack2
Observatory Site: iTelescope.net, Siding Spring, NSW, Australia
Camera: SBIG ST16803
Filters: Astrodon 3 nm OIII, 5 nm H-a+[NII], Gen 2 RGB
Guider: Starlight XPress Lodestar
Camera Operation: MaximDL 5.24
Processing: Photoshop cc 2015
Image Date: 12/31/2015 - 01/12/2016

1 Comment

  1. Sakib

    Wow OIII really shows the outer rim much more clearly than in LRGB. Also the central star is a visually split binary!


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