Celestial and Spaceflight Mechanics Laboratory, CU Boulder Exploiting astrodynamics for the manipulation of asteroids D. Garcia Yarnoz Advanced Space Concepts Laboratory University of Strathclyde, Glasgow, UK Slide 1
Outline Introduction to the ASCL and CU Boulder Research background Families in Hill s case with SRP Outcomes of the visit Slide 2
From ASCL: Visionspace Study astrodynamics at extremes of the length scale MACRO Spherical NKOs MESO Collector micro Pole-sitter Slide 3
To CU Boulder: CSML University of Colorado at Boulder: aerospace 14 th (9 th ) CCAR: astrodynamics Top 5 Celestial and Spaceflights Mechanics Laboratory: Dr. Scheeres Over 200 publications in the field of asteroid dynamics Slide 4
Asteroids Asteroid manipulation: from Macro to Micro MACRO: Orbit Deflection Capture Shepherding MESO: Rotation and Structure Spin-up, de-spin Break-up Binary orbit modification MICRO: Dust Transient atmospheres Material processing Slide 5
Ast. manipulation: examples Manifold Dynamics to Capture Asteroids D. García Yárnoz, J. P. Sanchez, C. R. McInnes 2013, Easily retrievable objects among the NEO population, Celestial Mechanics and Dynamical Astronomy 116 (4), pp 367-388 WIRED: Engineers Identify 12 Asteroids We Could Capture With Existing Rocket Technology MIT Technology Review: New Class of Easily Retrievable Asteroids Discovered Tech News World: Heigh-ho, Heigh-ho, It's Off to the Asteroid Mines We Go? SRP to Sort Material D. García Yárnoz, J. P. Sanchez, C. R. McInnes 2013, Passive Sorting of Asteroid Material Using Solar Radiation Pressure, Journal of Guidance, Control and Dynamics, to appear ~ Slide 6
Time-scale Asteroid manipulation: forces P-R YORP BYORP Yarkovsky Tidal Effects Collisions Flybys Manifold Dynamics Resonances Cohesion SRP Self Gravity Electrostatic Internal Strength Length-scale Slide 7
Background for the study SRP Dominated Highly Non-Keplerian Trajectories around Minor Bodies Broschart and Scheeres, 2005, 2007 L1 <<< To Sun QTO Broschart et al. 2013 Takahashi and Scheeres, 2011 To Sun Slide 8
Natural Periodic Solutions Natural inversion of orbit direction Prograde-retrograde phases Closed periodic solutions Unstable?? Hénon a/g families No sub-solar coverage Close prograde trajectories Slide 9
A Brief History of Pre-hillstory 0 S-E J-E S-J E-M 0.5 Hill 1886 Lord Kelvin 1892 Darwin 1897 Jackson 1913 Strömgren 1915 Matukuma 1930 1932 1933 1957 Hénon 1969 Hénon 1974 Szebehely 1967 Broucke 1968 Hénon 1965 Michalodimatrakis 1980 Perko 1982 Hénon 2005 Lara & Russell 2006 Lara Lam 2005 Russell Batkhin 2013 Verrier 2013 Yarnoz 201? Time Slide 10
Evolution with lightness number Bifurcation disappears: g and g disconnected Collision migrates towards L 2 point Right branch of g family ends up skirting forbidden region Family g crossing point gets smaller, almost disappearing of the map Slide 11
Family a evolution Slide 12
Family g double-periodic branch Slide 13
Outcomes of the visit Hill s case with SRP as relevant dynamic system for asteroid exploration Map, evolution, feasibility and stability of orbit families. Presented results at CCAR (introduced also ASCL) Writing up of a paper to be submitted to Celestial Mechanics Abstract submitted to be presented at Astrodynamics Specialists Conf. Establish ties ASCL-CSML for future collaborations John Moyes Lessells Travel Scholarship Mac Robertson Postgraduate Travel Scholarship Slide 14
e Daniel.Garcia-Yarnoz@strath.ac.uk Advanced Space Concepts Laboratory http://www.strath.ac.uk/ascl/aboutus/staff/danielgarciayarnoz/ Slide 15
Family g 19 December 2013 Slide 16
System Implementation Large area variations by deployable/movable panels or sails a) Tilting panels Deployable extra panels b) Quasi-rhombic pyramid (Ceriotti et al.) Smaller variations by varying reflectivity Q~1 Q>1 c) Electro-chromic devices Variations achieved up to 1.4 times the original reflectivity (Funase et al.) 19 December 2013 Slide 17