Sentry may refer to:

Sentry is a highly automated collision monitoring system that continually scans the most current asteroid catalog for possibilities of future impact with Earth over the next 100+ years. Whenever a potential impact is detected it will be analyzed and the results immediately published on the Near Earth Object Program. Two or three weeks of optical data is not enough to conclusively identify an impact years in the future. By contrast, eliminating an entry on the risk page is a negative prediction; a prediction of where it will not be. From the point of view of the general public, it isn't worth getting worried about an object with a couple of weeks of optical data showing a possible Earth encounter years from now.

Sentry Risk Table

The Impact Risk page lists a number of lost objects that are, for all practical purposes, permanent residents of the risk page; their removal may depend upon a serendipitous rediscovery.1997 XR2 was serendipitously rediscovered in 2006 after being lost for more than 8 years. Some objects on the Sentry Risk Table, such as 2000 SG344, might even be man-made.

Sentry (real name Curtis Elkins) is a member of The Jury in the fictional Marvel comic universe. His rank is commanding officer. His ethnicity is African-American.

Fictional character biography

Curtis Elkins was a Guardsman at the Vault a prison for super powered criminals. While there Curtis befriended Hugh Taylor, a new guardsman fresh out of the army. Curtis left the Vault sometime after Hugh was murdered by Venom during an escape.

After that Curtis and a few of his fellow Guardsmen joined The Jury, an agency organized by General Orwell Taylor. Their purpose was to track down and destroy Venom for his part in killing Hugh Taylor, Orwell's eldest son. To that end many of them were armed with sonic and fire generating weapons which the alien symbiote was vulnerable to. After Orwell was arrested for his part in the Arachnis Project, the Jury was reformed by his younger son Maxwell to fit the principles of civil rights and the legal court system. It was in fact a change done in accordance with Curtis' personal ideology of law and order. At a final fight with Hybrid, he was seriously injured, not only by physical damage, but also by mental contact with the symbiotes. Later Sentry and the other members of the Jury would be led by U.S. Agent and financed by Edwin Cord. The Jury was sent after the Thunderbolts but failed.