Friday 2 February 2024

Colour changes seen on Jupiter in 1860 with a Thomas Cooke telescope

 Part of a note on the changes in the colour of the equatorial belt of Jupiter by John Brown esq.

On a fine night in January 1860, I turned Mr Pritchard’s 6.75 inch equatorial by Cooke, for about half an hour on Jupiter. The planet was so well defined, and the details of the markings on the equatorial belt were so peculiar, that I mad a sketch of them, noting at the same time the remarkable brown colour of the equatorial belt. One of the edges of the belt (I think the upper side in the instrument) was beaded or divided into egg shaped masses, which must have been of brighter or lighter colour than the background of the belt, to have given them so much prominence.


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