user: Question: What is the largest mass for Tycho Crater?
Columns: ['U.S. mission', 'Mass (kg)', 'Booster', 'Launched', 'Mission goal', 'Landing zone', 'Lat / Lon']
Types: ['text', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Surveyor 1', 292.0, 'Atlas – Centaur', '30 May 1966', 'Moon landing', 'Oceanus Procellarum', '002.45S 043.22W']
SQL:

assistant: SELECT MAX("Mass (kg)") FROM "Table" WHERE "Landing zone" = 'Tycho Crater';