user: Question: Tell me the highest NGC number for right ascension of 09h40m28.5s
Columns: ['NGC number', 'Object type', 'Constellation', 'Right ascension ( J2000 )', 'Declination ( J2000 )']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2903.0, 'Spiral galaxy', 'Leo', '09h32m09.7s', '°30′03″']
SQL:

assistant: SELECT MAX("NGC number") FROM "Table" WHERE "Right ascension ( J2000 )" = '09h40m28.5s';