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Does anyone know what's the deal with the fairly consistent discoloration of the individual images? The edges are often orange and the middle blue. You'd think

Does anyone know what's the deal with the fairly consistent discoloration of the individual images? The edges are often orange and the middle blue. You'd think they'd colour correct this out when doing the stitching... Also, are these [0] artefacts a result of adaptive optics since they shine out those lasers to keep track of distortions? And these [1] which seem to be the same but larger and less focused. I remember seeing similar ones on Google Sky years back but never really figured out what causes it. [0] https://sky.esa.int/esasky/?target=94.25875681534997%2020.972184264700275&hips=DSS2+color&fov=3.124703578686123&cooframe=J2000&sci=true&lang=en https://sky.esa.int/esasky/?target=94.25875681534997%2020.97... [1] https://sky.esa.int/esasky/?target=218.7659069213465%20-59.64002122120938&hips=DSS2+color&fov=2.7157181080968167&cooframe=J2000&sci=true&lang=en https://sky.esa.int/esasky/?target=218.7659069213465%20-59.6...

cess11 2y ago
Maybe you could link to the images themselves rather than positions on the ESASky map? Those positions are associated with hundreds of thousands of images.
- moffkalast 2y ago
  Does it not open properly on your end? The artefacts seem pretty glaringly obvious in those locations and I've tested the links in another browser to make sure it's not caching the zoom or whatever. What you see when you load is the image I'd take. Anyhow, whoever can actually answer will surely know which ones I mean.
  - cess11 2y ago
    Aren't you referring to just the map? You find the images under a menu in the upper left corner.
xioxox 2y ago
Likely a "ghost" caused by a reflection from a bright star somewhere in the instrument: https://www.eso.org/%7Eohainaut/images/imageProc.html https://www.eso.org/%7Eohainaut/images/imageProc.html
- moffkalast 2y ago
  Ah that's it! So it does actually show the primary mirror of the telescope, with the hole in the middle probably being the struts holding up the secondary.

cess11 2y ago

Maybe you could link to the images themselves rather than positions on the ESASky map? Those positions are associated with hundreds of thousands of images.

moffkalast 2y ago
Does it not open properly on your end? The artefacts seem pretty glaringly obvious in those locations and I've tested the links in another browser to make sure it's not caching the zoom or whatever. What you see when you load is the image I'd take. Anyhow, whoever can actually answer will surely know which ones I mean.
- cess11 2y ago
  Aren't you referring to just the map? You find the images under a menu in the upper left corner.

xioxox 2y ago

Likely a "ghost" caused by a reflection from a bright star somewhere in the instrument: https://www.eso.org/%7Eohainaut/images/imageProc.html https://www.eso.org/%7Eohainaut/images/imageProc.html

moffkalast 2y ago
Ah that's it! So it does actually show the primary mirror of the telescope, with the hole in the middle probably being the struts holding up the secondary.