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Www.isas.jaxa.jp Slide 1 16 March 2016 6 th ICATT Extended Tisserand graph and multiple lunar swing-by design with Sun perturbation Daniel García Yárnoz,

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Presentation on theme: "Www.isas.jaxa.jp Slide 1 16 March 2016 6 th ICATT Extended Tisserand graph and multiple lunar swing-by design with Sun perturbation Daniel García Yárnoz,"— Presentation transcript:

1 www.isas.jaxa.jp Slide 1 16 March 2016 6 th ICATT Extended Tisserand graph and multiple lunar swing-by design with Sun perturbation Daniel García Yárnoz, Chit Hong Yam, Stefano Campagnola, Yasuhiro Kawakatsu 6 th ICATT. Darmstadt, Germany

2 www.isas.jaxa.jp Slide 2 16 March 2016 6 th ICATT Outline Intro Tisserand-Poincaré graph and extension Lunar transfer database Application examples –EQUULEUS –DESTINY Conclusions http://destiny.isas.jaxa.jp/

3 www.isas.jaxa.jp Slide 3 16 March 2016 6 th ICATT Background and rationale New trends in small missions: –Small sats / CubeSats beyond LEO, beyond cislunar space? Launch / escape strategies –Piggy-back / secondary payloads –Spiralling from LEO –Limited choice of date and target orbits conditions Moon: single, massive, close to ecliptic, high potential –Pump up/down –Phasing –Transfers Earth & Moon from PROCYON 

4 www.isas.jaxa.jp Slide 4 16 March 2016 6 th ICATT Tisserand-Poincare graph VILT Sun-kick (Campagnola & Russell 2009a,b)

5 www.isas.jaxa.jp Slide 5 16 March 2016 6 th ICATT Extension with Sun perturbation - - + + Numerical propagation (dashed) –Similar slope for low vel or low apocentres –Greater deviations achievable Issues: geometry dependant, multiple revs, deviations at ↑r a,v

6 www.isas.jaxa.jp Slide 6 16 March 2016 6 th ICATT Introducing: The “Mooning” Database (Lantoine & McElrath 2014)

7 www.isas.jaxa.jp Slide 7 16 March 2016 6 th ICATT 4 variables define a transfer Synodic frame and transfer parameters tFtF initial final

8 www.isas.jaxa.jp Slide 8 16 March 2016 6 th ICATT “Mooning” Database Structure Four types: oo, oi, ii, io Families branch off and reconnect (loops, helix) Example connections oi-oo: tangent to Moon orbit oi (continuos) oo (dashed) v

9 www.isas.jaxa.jp Slide 9 16 March 2016 6 th ICATT Database sub-families examples: n M =7 n SC =1 n SC =2 Planar Lyap / a fam g fam DPO / g’ fam (Broucke 1968)

10 www.isas.jaxa.jp Slide 10 16 March 2016 6 th ICATT Applications Two opposite problems: EQUULEUS: decrease velocity (+phasing) DESTINY: increase velocity (+phasing)

11 www.isas.jaxa.jp Slide 11 16 March 2016 6 th ICATT Application 1: EQUULEUS NASA offering 11-13 Secondary Payload opportunities on SLS EM-1 test launch JAXA proposed EQUULEUS to Moon L 2 http://www.nasa.gov/content/exploration-mission-1-secondary-payloads

12 www.isas.jaxa.jp Slide 12 16 March 2016 6 th ICATT Application 1: EQUULEUS results

13 www.isas.jaxa.jp Slide 13 16 March 2016 6 th ICATT EQUULEUS selected transfers

14 www.isas.jaxa.jp Slide 14 16 March 2016 6 th ICATT Application 2: DESTINY Interplanetary low-thrust traj. to asteroid Phaethon Escape from Earth-Moon system at least 1.5 km/s –Connect with spiral up with multiple flybys –Last swing-by velocity wrt Moon 2.08 km/s –SEM-vinf feasible pairs (1-3 km/s) Database search

15 www.isas.jaxa.jp Slide 15 16 March 2016 6 th ICATT DESTINY: Final leg search Assume last swing-by velocity < 2 km/s SEM-vinf pairs intersection with families 0.3-0.6 km/s Check rotation vinf latitude feasible Multiple solutions

16 www.isas.jaxa.jp Slide 16 16 March 2016 6 th ICATT DESTINY: transfer options Vel: 0.3-0.6 km/s Diverse shapes Multiple options Recursively backwards…

17 www.isas.jaxa.jp Slide 17 16 March 2016 6 th ICATT Conclusions and future work Small missions will benefit of trajectory design with one/multiple lunar swing-bys T-P graph allows estimation of reachable regions Database of trajectories built  easy generation of initial guesses Application examples Ongoing / future work: –Extension of database –Regularized eq. of motion –Pseudo-arclength continuation –Include π transfers (3D)

18 www.isas.jaxa.jp Slide 18 16 March 2016 6 th ICATT Kawakatsu Lab - 川勝研究室 http://kawakatsu.isas.jaxa.jp/ Daniel.Garcia@ac.jaxa.jp

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