Table: detached_objects
Columns: name
diameter_km
perihelion_au
aphelion_au
year_discovered
discoverer_s
type

Question: Who was the discoverer of the object with an Aphelion above 97 in 2004?
SQL: SELECT "discoverer_s" FROM detached_objects WHERE "aphelion_au" > 97 AND "year_discovered" = 2004