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Uranus.  The diameter of the disk is just 4 arcseconds - very small indeed.

 

Image info

Telescope:  Skywatcher 8" f/5 Newtonian

Focus:  Prime focus with 2x Barlow

Camera:  SAC7B, uncooled

Exposure:  unrecorded

Date:  4th Sept 2002

Processing:  Acquired in Astrovideo as FITS.  Stacked in Iris, 4x increase in size applied using the drizzle technique in Iris. 

Comments

Because the disk is so small, atmospheric conditions caused the image to wobble significantly.  The green image was chosen as the luminosity component and an LRGB composite made in Iris.  The image shows a reddish region in the lower right of the disk.  I don't know if this is a feature on the planet, of just optical distortion!

   
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