<Li> Heliospheric Origins with Solar Probe Plus (HeliOSPP)--A theory and modeling investigation to maximize the scientific return from the mission . The Principal Investigator is Marco Velli at UCLA and the Jet Propulsion Laboratory (JPL). </Li> <P> After the first Venus flyby, the probe will be in an elliptical orbit with a period of 150 days (two - thirds the period of Venus), making three orbits while Venus makes two . On the second flyby, the period shortens to 130 days . After less than two orbits (only 198 days later) it encounters Venus a third time at a point earlier in the orbit of Venus . This encounter shortens its period to half of that of Venus, or about 112.5 days . After two orbits it meets Venus a fourth time at about the same place, shortening its period to about 102 days . After 237 days it meets Venus for the fifth time and its period is shortened to about 96 days, three - sevenths that of Venus . It then makes seven orbits while Venus makes three . The sixth encounter, almost two years after the fifth, brings its period down to 92 days, two - fifths that of Venus . After five more orbits (two orbits of Venus) it meets Venus for the seventh and last time, decreasing its period to 88 or 89 days and allowing it to approach closer to the Sun . </P> <Table> Scheduled events <Tr> <Th> Year </Th> <Th> Date </Th> <Th> Event </Th> <Th> Distance from Sun (Gm) </Th> <Th> Speed (km / s) </Th> <Th> Orbital period (days) </Th> </Tr> <Tr> <Td> 2018 </Td> <Td> Aug 12 </Td> <Td> Launch </Td> <Td> 151.6 </Td> <Td>--</Td> <Td> 174 </Td> </Tr> <Tr> <Td> Oct 3 </Td> <Td> Venus flyby #1 </Td> <Td>--</Td> <Td>--</Td> <Td>--</Td> </Tr> <Tr> <Td> Nov 6 </Td> <Td> Perihelion #1 </Td> <Td> 24.8 </Td> <Td> 95 </Td> <Td> 150 </Td> </Tr> <Tr> <Td> 2019 </Td> <Td> Apr 4 </Td> <Td> Perihelion #2 </Td> <Td> 24.8 </Td> <Td> 95 </Td> <Td> 150 </Td> </Tr> <Tr> <Td> Sep 1 </Td> <Td> Perihelion #3 </Td> <Td> 24.8 </Td> <Td> 95 </Td> <Td> 150 </Td> </Tr> <Tr> <Td> Dec 26 </Td> <Td> Venus flyby #2 </Td> <Td>--</Td> <Td>--</Td> <Td>--</Td> </Tr> <Tr> <Td> 2020 </Td> <Td> Jan 29 </Td> <Td> Perihelion #4 </Td> <Td> 19.4 </Td> <Td> 109 </Td> <Td> 130 </Td> </Tr> <Tr> <Td> Jun 7 </Td> <Td> Perihelion #5 </Td> <Td> 19.4 </Td> <Td> 109 </Td> <Td> 130 </Td> </Tr> <Tr> <Td> Jul 11 </Td> <Td> Venus flyby #3 </Td> <Td>--</Td> <Td>--</Td> <Td>--</Td> </Tr> <Tr> <Td> Sep 27 </Td> <Td> Perihelion #6 </Td> <Td> 14.2 </Td> <Td> 129 </Td> <Td> 112.5 </Td> </Tr> <Tr> <Td> 2021 </Td> <Td> Jan 17 </Td> <Td> Perihelion #7 </Td> <Td> 14.2 </Td> <Td> 129 </Td> <Td> 112.5 </Td> </Tr> <Tr> <Td> Feb 20 </Td> <Td> Venus flyby #4 </Td> <Td>--</Td> <Td>--</Td> <Td>--</Td> </Tr> <Tr> <Td> Apr 29 </Td> <Td> Perihelion #8 </Td> <Td> 11.1 </Td> <Td> 147 </Td> <Td> 102 </Td> </Tr> <Tr> <Td> Aug 9 </Td> <Td> Perihelion #9 </Td> <Td> 11.1 </Td> <Td> 147 </Td> <Td> 102 </Td> </Tr> <Tr> <Td> Oct 16 </Td> <Td> Venus flyby #5 </Td> <Td>--</Td> <Td>--</Td> <Td>--</Td> </Tr> <Tr> <Td> Nov 21 </Td> <Td> Perihelion #10 </Td> <Td> 9.2 </Td> <Td> 163 </Td> <Td> 96 </Td> </Tr> <Tr> <Td> 2022 </Td> <Td> Feb 25 </Td> <Td> Perihelion #11 </Td> <Td> 9.2 </Td> <Td> 163 </Td> <Td> 96 </Td> </Tr> <Tr> <Td> Jun 1 </Td> <Td> Perihelion #12 </Td> <Td> 9.2 </Td> <Td> 163 </Td> <Td> 96 </Td> </Tr> <Tr> <Td> Sep 6 </Td> <Td> Perihelion #13 </Td> <Td> 9.2 </Td> <Td> 163 </Td> <Td> 96 </Td> </Tr> <Tr> <Td> Dec 11 </Td> <Td> Perihelion #14 </Td> <Td> 9.2 </Td> <Td> 163 </Td> <Td> 96 </Td> </Tr> <Tr> <Td> 2023 </Td> <Td> Mar 17 </Td> <Td> Perihelion #15 </Td> <Td> 9.2 </Td> <Td> 163 </Td> <Td> 96 </Td> </Tr> <Tr> <Td> Jun 22 </Td> <Td> Perihelion #16 </Td> <Td> 9.2 </Td> <Td> 163 </Td> <Td> 96 </Td> </Tr> <Tr> <Td> Aug 21 </Td> <Td> Venus flyby #6 </Td> <Td>--</Td> <Td>--</Td> <Td>--</Td> </Tr> <Tr> <Td> Sep 27 </Td> <Td> Perihelion #17 </Td> <Td> 7.9 </Td> <Td> 176 </Td> <Td> 92 </Td> </Tr> <Tr> <Td> Dec 29 </Td> <Td> Perihelion #18 </Td> <Td> 7.9 </Td> <Td> 176 </Td> <Td> 92 </Td> </Tr> <Tr> <Td> 2024 </Td> <Td> Mar 30 </Td> <Td> Perihelion #19 </Td> <Td> 7.9 </Td> <Td> 176 </Td> <Td> 92 </Td> </Tr> <Tr> <Td> Jun 30 </Td> <Td> Perihelion #20 </Td> <Td> 7.9 </Td> <Td> 176 </Td> <Td> 92 </Td> </Tr> <Tr> <Td> Sep 30 </Td> <Td> Perihelion #21 </Td> <Td> 7.9 </Td> <Td> 176 </Td> <Td> 92 </Td> </Tr> <Tr> <Td> Nov 6 </Td> <Td> Venus flyby #7 </Td> <Td>--</Td> <Td>--</Td> <Td>--</Td> </Tr> <Tr> <Td> Dec 24 </Td> <Td> Perihelion #22 </Td> <Td> 6.9 </Td> <Td> 192 </Td> <Td> 88 </Td> </Tr> <Tr> <Td> 2025 </Td> <Td> Mar 22 </Td> <Td> Perihelion #23 </Td> <Td> 6.9 </Td> <Td> 192 </Td> <Td> 88 </Td> </Tr> <Tr> <Td> Jun 19 </Td> <Td> Perihelion #24 </Td> <Td> 6.9 </Td> <Td> 192 </Td> <Td> 88 </Td> </Tr> <Tr> <Td> Sep 15 </Td> <Td> Perihelion #25 </Td> <Td> 6.9 </Td> <Td> 192 </Td> <Td> 88 </Td> </Tr> <Tr> <Td> Dec 12 </Td> <Td> Perihelion #26 </Td> <Td> 6.9 </Td> <Td> 192 </Td> <Td> 88 </Td> </Tr> </Table> <Tr> <Th> Year </Th> <Th> Date </Th> <Th> Event </Th> <Th> Distance from Sun (Gm) </Th> <Th> Speed (km / s) </Th> <Th> Orbital period (days) </Th> </Tr>

When will parker solar probe arrive at the sun
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