|OAS - Osservatorio Astronomico Sormano|
|OAS > PCEL - List of Planetary Close Encounters|
Last update: September 05, 2015 (next expected update: January 2016)
Computations by: Piero Sicoli , Francesco Manca (email@example.com).
This list includes close encounters of asteroids with planets Mercury, Venus and Mars for the next two centuries (some periodic comets are also included) using Software developed at Sormano Observatory. A list of Minor bodies with possible minimum planet-miss distance within 0.5 million km (0.003342 A.U), extracted from this page is available at CEIP. Two similar lists with close approaches to the Earth are available at MBPL - Minor Body Priority List ( with H<= 22.0 ) and SAEL - Small Asteroids Encounters List (with H > 22.0) page ( software for the Earth MOID by F. Manca, G. Matarazzo, P. Sicoli , Sormano Observatory ).
Multi-opposition minor planets with MOID (Minimum Orbital Intersection Distance) lower than 0.0100 AU have been selected from Bruce Koehn's and Ted Bowell's orbit intersections .
Their motions were integrated in order to point out encounters within 0.02 AU (software by A. Testa, Sormano Observatory). Among these , we select the most interesting close encounters (depending on MOID, U parameter, nominal distance, propagation of the error etc.) for which the future minimum (min) and maximum (max) miss distances in AU are computed using the OrbFit Software Package. These values, based on a 3-sigma uncertainty confidence level, are reported at the left of the nominal result and a symbol " r " means that available radar observations have been included in the orbital solution.
Any comment and/or suggestion will be welcomed.
The following service, courtesy of the Minor Planet Center, is intended as support and in addition to the objects available in the PCEL list for which follow-up or recovery is needed. The service will return all objects based on criteria specified by the user.