user: Question: what is the right ascension (j2000) when the apparent magnitude is 13?
Columns: ['NGC number', 'Object type', 'Constellation', 'Right ascension ( J2000 )', 'Declination ( J2000 )', 'Apparent magnitude']
Types: ['real', 'text', 'text', 'text', 'text', 'real']
Sample row: [3021.0, 'Spiral galaxy', 'Leo Minor', '09h50m57s', '°33′15″', 12.2]
SQL:

assistant: SELECT "Right ascension ( J2000 )" FROM "Table" WHERE "Apparent magnitude" = 13.0;