Observations of Venus in infra-red and ultra-violet

The spring of 2023 sees an excellent apparition of Venus in the western sky (eastern elongation of Venus), with the planet high in a late afternoon or dusk sky. I have a campaign currently to image Venus in infra-red and ultra-violet as frequently as possible, to study the changing cloud features. These are shown with greatest contrast in UV, but UV images are usually quite blurred due to atmospheric seeing and the properties of a Schmidt Cassegrain telescope. IR images are sharper, and sometimes show some low-contrast cloud features deeper in the atmosphere than the UV features.

Where I have been able to image the planet on successive evenings I have grouped these sets together. The atmosphere rotates by 90º in 24 hours, so, as one would expect with the gibbous phase, the cloud features visible change completely from one evening to the next just through the rotation. The phase will reduce and the apparent diameter will increase over the coming months.

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