Abell 33 is a planetary nebula in the constellation Hydra, approximately 2,500 light years from Earth. A planetary nebula is created when a star blows off its outer layers after running out of fuel.
Abell 33 is off axis to the Milky Way so its expansion remained mostly unhindered by interstellar materials, resulting in its spherical shape. The bright rim is a result of our seeing more gases along the 3-dimensional edge of the bubble. Abell 33 is approximately 4.5 arcminutes in diameter, about 1/7 the diameter of the moon as seen from Earth. The nebula is by chance aligned with a 7th magnitude foreground star along its edge (HD 83535) giving a diamond ring appearance. The nebula’s progenitor star, on its way to becoming a white dwarf, is the white spot just off-center inside the bubble.
This narrowband image was shot using Oxygen 3 and Hydrogen Alpha filters, with the Ha mapped to the red channel and O3 mapped to the green and blue channels of this RGB image. Shot with our RiLA 600mm (Voyager), RiFAST 400mm (Voyager) and four RH 300mm telescope array (Voyager SC Observatory Version).
SC Observatory team: Mike Selby, Stefan Schmidt, Andy Chatman
Full details on our website: https://www.masterdarks.com/abell-33/