What is the {astronomical catalog} with the {MIN(wavelength)} whose {instance of} is {astronomical catalog}  ?
What collection of actronomical objects has the smallest wavelength?
What is the collection of astronomical objects with the smallest wavelength?
SELECT ?t WHERE { ?t rdf:type ontology:astronomical_catalog . ?t property:wavelength ?l . ?t rdf:type ontology:astronomical_catalog . }
select ?ent where {
?ent <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q605175>.

?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?ent .
?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2808>.
?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj1.

?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?ent .
?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P31> .
?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q605175> .

}
ORDER BY ASC(?obj1)
LIMIT 5
select ?ent where { ?ent wdt:P31 wd:Q605175 . ?ent wdt:P2808 ?obj . ?ent wdt:P31 wd:Q605175. } ORDER BY ASC(?obj)LIMIT 5 
2MASS 2MASS 2MASS Fourth Cambridge Survey Third Cambridge Catalogue of Radio Sources