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Using orbital integrations of particles ejected from Comet Halley's passagesbetween 1404 BC and 240 BC, the authors investigate possible outbursts of theOrionids (twin shower of the Eta Aquariids) that may have been observed in thewestern hemisphere. In an earlier orbital integration study the authorsdetermined there was a high probability linking probable outbursts of the EtaAquariid meteor shower with certain events recorded in inscriptions during theMaya Classic Period, AD 250-900. This prior examination was the firstscientific inquiry of its kind into ancient meteor outbursts possibly recordedin the western hemisphere where previously no pre-Columbian observations hadexisted. In the current paper the aim is to describe orbital dynamics of rarebut probable Orionid outbursts that would have occurred on or near applicabledates recorded in the Classic Maya inscriptions. Specifically, significantprobable outbursts are found in AD 417 and 585 out of 30 possible target years.The driving mechanisms for outbursts in those two years are Jovian 1:6 and 1:7mean motion resonances acting to maintain compact structures within the Orionidstream for over 1 kyr. Furthermore, an Orionid outburst in AD 585 recorded byChina is confirmed.

Orbital dynamics of highly probable but rare Orionid outbursts possibly observed by the ancient Maya