Table: ngc_objects_3001_4000_3
Columns: ngc_number
object_type
constellation
right_ascension_j2000
declination_j2000

Question: what is the right ascension (j2000) when the constellation is sextans and the declination (j2000) is °28′01″?
SQL: SELECT "right_ascension_j2000" FROM ngc_objects_3001_4000_3 WHERE "constellation" = 'sextans' AND "declination_j2000" = '°28′01″'

Question: what is the constellation when the Right ascension ( J2000 ) is 10h18m58.4s?
SQL: SELECT "constellation" FROM ngc_objects_3001_4000_3 WHERE "right_ascension_j2000" = '10h18m58.4s'

Question: what is the highest ngc number when the declination (j2000) is °25′26″?
SQL: SELECT MAX("ngc_number") FROM ngc_objects_3001_4000_3 WHERE "declination_j2000" = '°25′26″'