Observation by David Swan: Atmospheric dispersion

Uploaded by

David Swan

Observer

David Swan

Observed

2018 Jun 28 - 20:37

Uploaded

2018 Jul 01 - 18:44

Objects

Jupiter

Equipment

200mm SCT @ f/10
ASI178MC
Baader UV+IR cut
FireCapture and AS!3

Exposure

1 x 10ms frame

Location

Tynemouth, UK

Target name

Jupiter, Io, Ganymede, Europa

Title

Atmospheric dispersion

About this image

A nice demonstration of the dispersion of light through high airmass.

Files associated with this observation

atmosphericdisp.png (239.2 kB)

Like this image

Dawson, Jeremy Shears, Chris Hooker, Peter Mulligan, Ray Emery, Martin Lewis, Peter Carson, Andy Wilson

Comments

Dawson, 2018 Jul 01 - 18:53 UTC

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

Chris Hooker, 2018 Jul 01 - 19:13 UTC

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.

Chris

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