The NASA SSD/CNEOS Sentry API gives developers access to results from the Center for Near-Earth Object Studies (CNEOS) Sentry system. The Sentry system provides highly automated collision monitoring. It continually scans the most current asteroid catalog for objects that could impact with Earth within the next 100 years. The API can return details, summary data, or VI data for a given Sentry object. Developers can also get data for objects removed from Sentry.