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Ground Observation of Lunar Impact by LCROSS

Young-Jun Choi KASI. Ground Observation of Lunar Impact by LCROSS. LCROSS (Lunar Crater Observation and Sensing Satellite). It’s about the water … Clementine (1994) Lunar Prospector (1999) LRO (2009) If water-ice is confirmed, Water Breathable oxygen Rocket fuel.

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Ground Observation of Lunar Impact by LCROSS

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  1. Young-Jun Choi KASI Ground Observation of Lunar Impact by LCROSS

  2. LCROSS (Lunar Crater Observation and Sensing Satellite) • It’s about the water … • Clementine (1994) • Lunar Prospector (1999) • LRO (2009) • If water-ice is confirmed, • Water • Breathable oxygen • Rocket fuel

  3. Launch : 18 June, 2009

  4. Shepherding Spacecraft (S/SC)

  5. Science for each stage • Expansion of Plume • Thermal Evolution • H2O ice sublimation • Photo-production of OH • Bright Impact Flash • Thermal OH Production • Rapid Thermal Evolution • Residual Thermal Blanket • Expanding OH Exosphere The combination of ground-based, orbital and in-situ platforms span the necessary temporal and spatial scales: from sec/meters to hours/km

  6. Viewing the impact View of Moon from Earth on 9 October 2009, 4:30 a.m. PT

  7. Viewing the Impact Terrestrial landmasses facing Moon at time of impact. Earth’s morning terminator at time of impact.

  8. LCROSS observation campaign :Observatories Lunar, Earth-orbiting , and Ground-based Assets

  9. Lunar Orbital LRO, Chandrayaan-1 23 24 Earth Orbital HST, Odin, IKONOS, NFIRE, EO-1 18 19 20 21 22 14 11 6 7 9 16 8 12 13 Ground 1. Keck Observatory 2. CFHT 3. Gemini Observatory North 4. Subaru Telescope 5. IRTF 6. Lowell Observatory 7. MRO 8. Apache Point 9. MMT 10. SALT 11. Korean ASSI 12. SOFIA 13. Mount Wilson 14. Allen Telescope Array 15. Air Force Maui Optical and Supercomputing Site 16. Automated Lunar and Meteor Observatory 17. IFA,Haleakala 1 2 3 17 4 5 15 Earth Orbit 18. HST 19 Odin 20. IKONOS (GeoEye) 21. NFIRE (Missile Defense Agency) 22. EO-1 Lunar Orbit 23. LRO 24. Chandrayaan-1 10

  10. LCROSS observation campaign : KASI observation • Impact flash detection (Mt. Lemmon 1m Tel.) • Energy(released by flash) = η K.E. • η : Luminous efficiency (~ 10-5 ~ -6) • Flash duration : 0.06 ~ 0.6 second • Fast drift scan • Plume evolution (BOAO 1.8 m Tel.) • OH exosphere • Volatile gases

  11. LCROSS observation campaign : communication system Voice Loop: Telecon line LCROSS Campaign Coordinator LCROSS SOC Astronomers Observatories Text Chat Data file transfer: Email & FTP Secure line LCROSS EPO / PAO •  NASA LCROSS Website • Citizen Scientist Portal • Twitter account, Facebook status page • (real-time telemetry updates, data) LCROSS MISSION OPERATIONS CENTER Website

  12. The following timeline shows the information conveyed from the Campaign Coordinator (SOC) to the Astronomers. Times listed below are in reference to Centaur impact (T-0). Campaign Coordinator will provide information at prescribed times as outlined here via text and voice plus will be available & responding to Astronomer questions (text, voice, email) continuously during the duration of timeline. Centaur Separation T-10h T-9h T-8h ………………… T-1h T-10h: Begin comm: update on Centaur- S/S-C stack status & position, expected separation time, expected impact location & time. T-9h 50m: Confirmation of Centaur & S/S-C separation, update on Centaur- S/S-C stack status & position, updates re. impact location & time. T-9h - T-1h: Hourly updates regarding Centaur & S/S-C position, status, payload ops & data return, expected impact location & time. T-1h: Poll Astronomers – who is online, weather, conditions, etc. T-50m T-40m T-30m T-20m T-10m T-1 m T-0 IMPACT T-1m – T-0: Continuous updates regarding Centaur & S/S-C. T-10m – T-1: Updates every minute regarding Centaur & S/S-C position, status, expected impact location & time. T-0: Confirmation of impact, indicate exact impact location. T-50m – T-10m: Updates every 10 minutes regarding Centaur & S/S-C position, status, payload ops & data return expected impact location & time. T-50m: Payload on, indicate are streaming data online. T-0 T+1m T+2m T+3m T+4m T+1h T+2h T+4 Confirmation of S/S-C impact. T+4 – T+2h+: Comparison of S-S/C data with Astronomer observations. T-0 – T+4: Real-time info re. S/S-C data.

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