SH33C-3657 SLS Applied To Small Payload Pragmatic Maximization Of Asymptotic Fly-out On a High Speed Escape Trajectory Speed For Near-Term Exploration of the Near-term exploration of the interstellar medium in the region of 200-1000 AU is possible with existing technology, but remains programmatically challenging due to Interstellar Medium the long travel times, long periods of mission inactivity, and overall mission costs. We consider multiple trajectories that will provide a range of possible science 1 1 1 1 1 2 returns, including the in situ measurements so needed from the interstellar medium Brian W. Lathrop , Ralph L. McNutt, Jr. , Michael V. Paul , Vikas Vepachedu , Steven R. Vernon , Robert Stough itself. Flybys of the gas- or ice- giant planets, observations of our solar system disk 1 The Johns Hopkins University Applied Physics Laboratory, Laurel, MD and zodiacal light, a second reconnaissance of Pluto, flybys of newly discovered ( ) Kuiper Belt Objects, or a close-up of the putative super-Earth, “Planet X,” all present (2) NASA Marshall Space Flight Center, Huntsville, AL compelling opportunities but require different departure trajectories, or aim points. Furthermore, an Interstellar Probe Mission departing the solar system at up to 20 AU/year will fly by objects in our solar system at many 10s of kilometers per second, Mission architectures to explore our habitable astrosphere. several times faster than New Horizons’ flyby of Pluto. We will present trajectories that address these different objectives, possible overlapping solutions, challenges to Seeking a solar system escape at up to 90 km/s (20 AU/year) achieving different families of solutions, and ultimate asymptotic fly out speeds. using conventional rocketry and existing technology. Option 1:Passive Jupiter Gravity Assist Option 3:Solar Oberth Maneuver Heliocentric Ecliptic J2000 Coordinates Heliocentric Ecliptic Heliocentric Ecliptic Longitude Longitude Max Escape Case with Castor30XL Kick Stage Launch C3= 100 Heliocentric Ecliptic Longitude 2034 Launch Variable Launch C3 Launch C3 = 441 2039 Launch 2037 Launch Variable Launch C3 Heliocentric Ecliptic J2000 Coordinates 2030 Launch Variable 3 Launch C3 Heliocentric Ecliptic J2000 Coordinates Option 2 Powered Jupiter Gravity Assist 2 : Heliocentric 1 Ecliptic Longitude Solar Flyby Kick Stage Solar Flyby Star48 BV Kick Stage Kick Stage Launch C3= 100 Launch C3 = 441 Heliocentric Ecliptic J2000 Coordinates 2032 Launch Increase in complexity of mission results in increased asymptotic flyout speed Cross-disciplinary approach, provides science For Option 3, thermal return in many areas: - Heliophysics, Astrophysics, Exoplanets Option 1 ~ 35 km s shielding may - Planetary and KBO flybys / - Zodiacal Dust, System Disk imaging Option 2 ~ 41 km s 1 significantly exceed / Parker Solar Probe 2 requirements. \.