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Atmospheric dispersion


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About this observation
David Swan
Time of observation
28/06/2018 - 21:37
Jupiter, Io, Ganymede, Europa
Observing location
Tynemouth, UK
200mm SCT @ f/10
Baader UV+IR cut
FireCapture and AS!3
1 x 10ms frame
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A nice demonstration of the dispersion of light through high airmass.


dawson's picture

It would be interesting to see how much correction an ADC provided here.

Chris Hooker's picture

Hi David,

It's probably worth pointing out that this is an "astronomical" view, i.e. inverted. Atmospheric refraction raises the shorter wavelengths more than the longer ones, hence the green flash at sunset, and so on. To answer James's question, an ADC can compensate for dispersion of several arc seconds, which only occurs at far lower altitudes than Jupiter in this image, but in my experience they can be fiddly to set correctly.

This is a nice demonstration of the phenomenon, though.


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