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Fig. 1

image

Positions of radiants of the particles representing the modeled stream of comet C/1917 F1 in orbits, along which they approach the Earth’s orbit within 0.05 AU. The positions are shown for the stream not influenced by the P-R drag, which was modeled in time 50 kyr in the past. The Hammer projection of the equatorial coordinate frame is used. The green full circles (red crosses) show the positions of the radiants of observed meteors recorded in the SonotaCo-video (photographic IAU MDC) database. The black empty squares show the positions of the radiants of modeled particles. The sinusoid-like curve illustrates the ecliptic. The positions are shown in two variants. In plot a), the radiants of observed meteors are covered by those of modeled particles; therefore, the latter are seen transparently. In contrast, the radiants of modeled particles are covered by those of observed meteors in plot b). The positions of the radiants of observed meteors are seen transparently here. The positions of observed radiants are identical in all presented figures.

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