A multiple planet ARM/SEP derived mission design architecture (Part 2)
The Proposed Lucy Trojan tour is a spacecraft that incorporates into its mission design journey to both Trojan swarms at L4 and L5 with an earth flyby in between the L4 and L5 targets, this could be an opportunity for a Enceladus sample return. Hows that you might wonder?
Let’s go back to the first blog article inspired by Otsuka and Strange who proposed Cassini Saturn escape orbits at end of mission Saturn Cassini ballistic end of mission.This idea could allow a Enceladus sample return mission to utilize a Titan flyby to a Lucy Jupiter Trojan mission after a 9 year flight from Saturn Lucy Jupiter Trojan tour mission .You will note at near end of mission Lucy does an Earth gravity assist on its way to its last Jupiter Trojan asteroid, it’s here we drop off the saturn/Enceladus samples.
Perhaps the inbound spacecraft could perform the Jupiter B plane Aim Point so as to perform the Earth flyby first with a subsequent Lucy Jupiter Trojan tour?The paper by Broucke and Prado possibly describes how a spacecraft returning from the outer solar system could use Jupiter to bring back samples from Saturn, AAS93177JupSB “JUPITER SWING-BY TRAJECTORIES PASSING NEAR THE EARTH” Or rather I should say they describe a Earth Jupiter Earth trajectory.I would think the proposed Enceladus sample return missions might incorporate this sort of trajectory in their mission design?
Any Enceladus time of flight to Saturn would be 7 to 8 years and Saturn orbit mission 4 to 5 more.Add in the 9 year time of flight to Jupiter followed by a 9 year Trojan Mission comes out to 29 years.For safety and risk reduction the spacecraft should have on board a space based microscope in case of failure to return the samples to Earth from Enceladus.
Risk reduction would be to keep the Saturn/Enceladus TOF to a minimum.SEP might reduce the 9 year TOF back to Jupiter
The proposed ARM/SEP designs with its 11 tons of Zenon could make for a unique flagship mission.Outbound Jupiter flybys might allow for Jupiter and Saturn atmosphere probes.
SLS launch vehicle
I ARM derived SEP
2 spacecraft with common avionics
3 atmosphere probes with common architecture
1 spacecraft separates for a Uranus and probe mission
The other performs the saturn/jupiter trojan mission
SEP returns to Earth L2
A good description of budgetary and mission design is here Future Planetary exploration