What is the name of the of the balloon-borne telescope with the largest wavelength?
select ?ent where { ?ent wdt:P31 wd:Q4851844 . ?ent wdt:P2808 ?obj . ?ent wdt:P31 wd:Q4851844 } ORDER BY DESC(?obj)LIMIT 5 
balloon-borne telescope: Q4851844 balloon-borne telescope: Q4851844