Observation by Alan Snook: Jupiter - transits of Io and Callisto

Uploaded by

Alan Snook

Observer

Alan Snook

Observed

2026 Mar 17 - 20:43

Uploaded

2026 Mar 20 - 12:07

Objects

Jupiter

Equipment

Altair Astro 130EDT refractor, ZWO ASI662MC, UVIRBlock.

Location

Kent, UK

Title

Jupiter - transits of Io and Callisto

About this image

A disappointing result from a new camera. I thought the conditions were about average and I was expecting better. I must be doing something wrong. Measuring the first and last images and doing a few 'fag packet' sums: Io has moved 2.03 times the distance that Callisto has. Their average orbital speeds are 17.3km/s and 8.2km/s. That's a ratio of 2.11. So I am about 4% adrift. Io does have a somewhat elliptical orbit, perhaps it was near apojove and moving a little slower than average.

Files associated with this observation

Mosaic.png (355.0 kB)

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