What is the {binary star} with the {MIN(luminosity)} whose {instance of} is {binary star}  ?
Which is the binary star with the lowest luminosity, whose instance of is binary star?
What is the binary star with the minimum luminosity whose instance of is binary star?
SELECT ?n WHERE { ?n property:luminosity ?p . ?n rdf:type ontology:binary_star . . ?n rdf:type ontology:binary_star }
select ?ent where {
?ent <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q50053>.

?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/P2060>.
?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/Q50053> .

}
ORDER BY ASC(?obj1)
LIMIT 5
select ?ent where { ?ent wdt:P31 wd:Q50053 . ?ent wdt:P2060 ?obj . ?ent wdt:P31 wd:Q50053. } ORDER BY ASC(?obj)LIMIT 5 
Lalande 21185 Proxima Centauri 2M1207 Kepler-16 Kepler-411