Identification of meteoroid streams from Apollo asteroids in the Adelaide radar orbit surveys

摘要: A search is made for asteroid-related meteoroids among the 3759 orbits determined in two Adelaide radar meteor orbit surveys of 1960s; these are only southern hemisphere yet completed. All compared to all known comets and established showers. For comparatively modest numbers correlated meteors found. In contrast, a similar comparison with Aten, Apollo Amor asteroids discovered through 1986 October reveals strong associations several asteroids. new powerful technique developed which allows recognition streams associated specific parent objects, when large analyzed. Apart from 3200 Phaethon, Geminid parent, meteoroid found be 1566 Icarus, 2101 Adonis, 2201 Oljato, 2212 Hephaistos, 1937 UB (Hermes), 5025 P-L, 1982 TA, 1984 KB. These give rise velocity at least ∼22 km sec−1. There also evidence activity few other Apollos; no any Atens or Amors. Theoretical radiants velocities calculated perihelion distance less than 1.025 AU approach Earth within 0.1 AU, it shown that lack observed each can explained terms being inaccessible site (35°S), observations appropriate time year, expected below 20 sec−1 hence producing little ionization having severely reduced probability detection. It therefore appears general feature