Capture into Earth Orbit
Identifying a realistic scenario whereby the Perigee-Zero cometary body is captured into a terrestrial orbit is a challenging problem. A primary scenario being put forth here is that of a harmonic relationship between the earth, the Sun, other planets, and the comet body.
Alternatively, a cometary orbit that decayed into an orbit which intersected the Earth’s orbit within the range of our Earth’s Lagrange Points would allow a transfer from solar orbit to terrestrial orbit. A spent rocket casing recently did undergo such a transition - both ways - into and back out of Solar orbit.
These so-called Trojan Points are quite interesting in their own right. According to a NAS web page, WAMP Mission The Lagrange Points
One plausible scenario has recently been suggested. This involves an energetic impact at a low angle, directly from solar orbit. The impact tears free a chunk of terrestrial debris, which along with a component of the comet itself, is ejected into an earth orbit. Such a scenario has been proposed for the creation of our Moon. In this particular scenario, we would propose the creation of a much smaller orbital “ring” of debris. It would be the decay and de-orbiting of this debris ring that would generate the Perigee-Zero events.No large asteroids have been found at the Trojan points of the Earth-Moon or Earth-Sun systems. However, in 1956 the Polish astronomer Kordylewski discovered large concentrations of dust at the Trojan points of the Earth-Moon system. Recently, the DIRBE instrument on the COBE satellite confirmed earlier IRAS observations of a dust ring following the Earth's orbit around the Sun. The existence of this ring is closely related to the Trojan points, but the story is complicated by the effects of radiation pressure on the dust grains.