Welp, I tried. Arrakis is supposedly the third planet in Canopus. In our universe, Canopus has just two planets and no references to the Dune Canon.
I may nip to Caladan now...
After that, I may go and check out LV 426.
I've also visited Canopus hoping to find Arrakis - but was likewise disappointed to find no 3rd planet even... is it inhabited by a sufficiently advanced civilisation to build a planet-scale cloaking device - or has an unfortunate inter-dimensional incident involving a galaxy far, far away resulted in its destruction by an imperial space station? ...or were there Vogons involved?
That Caladan looks just about right - a very watery world with a few patches of land... why on earth would one want to give that up for scorching desert and mile-long predatory worms? Oh, there was politics involved? The Spice Must Flow!