Why Do Pluto and Charon Share the Same Diffraction Spike Orientation?

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The discussion centers on the observation that Pluto and Charon exhibit the same diffraction spike orientation in images taken by the Hubble Space Telescope. The brighter vertical and horizontal planes seen in both objects are attributed to diffraction spikes caused by the telescope's secondary mirror support structure, rather than atmospheric effects. The phenomenon, commonly referred to as "diffraction spikes," occurs due to the optical design of the telescope. This consistent orientation raises questions about the nature of the optical effects in astronomical imaging. Understanding these spikes is crucial for interpreting images of celestial bodies accurately.
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Below is a shot of Pluto and Charon from Hubble in 2006. I was wondering why the vertical and horizontal planes appear brighter in the same direction for both objects?
I thought the increased "twinkle" at perpendicular angles was normal effect from objects and didn't have any particular orientation. That made me think it was odd both these objects had the same orientation to their brighter “twinkle”. Is it something to do with the optics of a telescope?

Also, is there actual name for this effect, other than twinkle?
hs-2006-29-a-small_web.jpg


Link:http://hubblesite.org/newscenter/archive/releases/solar-system/pluto/2006/29/
 
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This is not an effect of the atmosphere. Those lines are from the telescope (from the support structure of the secondary mirror), and the telescope is the same for both objects: Diffraction spike.
 
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