The Ghost of Jupiter (also known as NGC 3242, or Caldwell 59) is a planetary nebula, located at a distance of around 4,800 light-years in the constellation of Hydra. It was discovered on the 7th of February 1785 by William Herschel.
The nebula is also referred as the Eye Nebula, and it got its name (i.e., Ghost of Jupiter) due to its similar size to the planet. The nebula is around two light years across and at its centre there is a white dwarf.
From analysis of observations it was estimated that the inner layer of the nebula was formed around 1,500 years ago. Furthermore, the two ends of the nebula display lobes of fast moving gas. This feature is known as Fast Low Ionization Emission Region, which is a gas volume of low ionization, that moves at supersonic speeds. This is observed in many planetary nebulae, and it is observed near the symmetry axis.
Image 1: Composite optical image of the Ghost of Jupiter taken with the Hubble Space Telescope (HST). The image was created using narrow band filters that are focused on the emission of oxygen (blue) and hydrogen (red), together with a broadband filter (green).
Image 1 Credit: NASA/ESA
Image 2 Credit: NASA/JPL-Caltech
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