El Reg» Proxima Centauri... more like Pulvereus Centauri, amirite?*
'Pulvereus' means dusty. 'Proxima' is either feminine singular (nominative or ablative) or neuter plural (nominative, vocative or accusative) and I'm going with nominative feminine singular. That would make dusty then 'pulverea'.
However, once named, may a celestial body be renamed?