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LLR/Interplanetary Session Summary

LLR/Interplanetary Session Summary. Jürgen Müller Tom Murphy. LLR/Interplanetary Session. 1 talk in Canberra, 9 talks and 2 posters this year! Sergei Kopeikin: LLR Formulation SSB frame ordinarily used in LLR analysis any frame could be used (e.g., geocenter)

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LLR/Interplanetary Session Summary

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  1. LLR/Interplanetary Session Summary Jürgen Müller Tom Murphy

  2. LLR/Interplanetary Session • 1 talk in Canberra, 9 talks and 2 posters this year! • Sergei Kopeikin: LLR Formulation • SSB frame ordinarily used in LLR analysis • any frame could be used (e.g., geocenter) • must be careful not to misinterpret gauge-dependent terms as unambiguous physical effects • Tom Murphy: APOLLO • 2 years into campaign • LLR firmly in multi-photon regime • 1-mm level error estimates; no sign of excess scatter • fit to model imperfect, but APOLLO addressing lunar orientation to new degree of precision

  3. LLR/Interplanetary Session • Liliane Biskupek: LLR analysis • using 38-year LLR data to investigate earth orientation parameters (EOP) • some differences in nutation compared to MHB2000 (also seen by Jim Williams) • also looked at daily earth orientation to study UT1 and VOL • Simone Dell’Agnello (for Currie): NG LLR reflectors • plans for sparse lunar reflector array, using large cubes • test new gravity paradigms (e.g., Dvali et al.) • 100 mm cube: careful control of thermal paths • anchor 1m into ground • testing cube at SCF in Frascati

  4. LLR/Interplanetary Session • Jan McGarry: LRO ranging • 28 Hz, sync to PPS, 8 ms earth gate each cycle • 1–10 fJ/cm2 energy density limit • 10–30 sec “real-time” web confirmation of hits • ranging by arrangement, starting June 2009 • Anthony Mallama: LRO requirements • pointing, priority, software mods, timing capability • methods for verifying pointing (~3 arcsec demonstrated) • Chris Clarke: Logistics • predictions (including point-ahead) in CPF format • plan to have weekly schedules

  5. LLR/Interplanetary Session • Jerrry Wiant: MLRS prep for LRO • achieve 1–2 arcsec pointing offset from crater • use Glonass to scan beam and understand divergence • no real hardware changes; almost all software • Randy’s done that • Maria Zuber: interplanetary ranging • can use to understand orbits, rotations, precession, asteroids, J2 of sun, etc. • MESSENGER demo: 24 Mkm 2-way • MOLA 80 Mkm Earth to Mars 1-way • LRO is first planetary S/C with CCR array

  6. LLR/Interplanetary Posters • Wasilla Zerhouni: LLRcelestial pole determination • Tomasz Niedzielski: minimum duration for sea level rise determination • And: Ukrainian frogs (not ducks) say: Quack

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