Young-Jun Choi KASI. It’s about the water … Clementine (1994) Lunar Prospector (1999) LRO...
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Transcript of Young-Jun Choi KASI. It’s about the water … Clementine (1994) Lunar Prospector (1999) LRO...
Ground Observation of Lunar Impact by LCROSS
Young-Jun ChoiKASI
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
Launch : 18 June, 2009
Shepherding Spacecraft (S/SC)
• Bright Impact Flash• Thermal OH Production• Rapid Thermal Evolution
• Expansion of Plume• Thermal Evolution• H2O ice sublimation• Photo-production of OH
• 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
Science for each stage
View of Moon from Earth on 9 October 2009, 4:30 a.m. PT
Viewing the impact
Terrestrial landmasses fac-ing Moon at time of im-pact.
Viewing the Impact
Earth’s morning ter-minator at time of im-pact.
Lunar, Earth-orbiting , and Ground-based Assets
LCROSS observation campaign :Observatories
Earth Orbital HST, Odin, IKONOS, NFIRE, EO-1Earth Orbital HST, Odin, IKONOS, NFIRE, EO-1
Lunar Orbital LRO, Chandrayaan-1Lunar Orbital LRO, Chandrayaan-1
6 7 9
52
41 3
Ground1. Keck Observatory2. CFHT3. Gemini Observatory North4. Subaru Telescope5. IRTF6. Lowell Observatory7. MRO8. Apache Point9. MMT10. SALT11. Korean ASSI12. SOFIA13. Mount Wilson14. Allen Telescope Array15. Air Force Maui Optical and
Supercomputing Site16. Automated Lunar and Me-
teor Observatory17. IFA,Haleakala
8
10
11
12
15
16
17
24
13
14
18 19 20
23
21 22
Earth Orbit18. HST19 Odin20. IKONOS (GeoEye)21. NFIRE (Missile De-
fense Agency)22. EO-1
Lunar Orbit23. LRO24. Chandrayaan-1
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 secondFast drift scan
Plume evolution (BOAO 1.8 m Tel.) OH exosphere Volatile gases
LCROSS observation campaign : communication system
LCROSS Campaign Co-ordinator
LCROSS Campaign Co-ordinator AstronomersAstronomers
LCROSS SOC Observatories
NASA LCROSS Website Citizen Scientist Portal
Twitter account, Facebook status page(real-time telemetry updates, data)
NASA LCROSS Website Citizen Scientist Portal
Twitter account, Facebook status page(real-time telemetry updates, data)
LCROSS EPO / PAOLCROSS MISSION
OPERATIONS CENTER
Secu
re li
ne
Voice Loop: Telecon line
Text Chat
Data file transfer: Email & FTP
Website
T-10h T-9h T-8h………………… T-1hT-10h T-9h T-8h………………… T-1h
T-50m T-40m T-30m T-20m T-10m T-1 m T-0T-50m T-40m T-30m T-20m T-10m T-1 m T-0
The following timeline shows the information conveyed from the Campaign Coordinator (SOC) to the As-tronomers.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.
T-9h - T-1h: Hourly updates regarding Centaur & S/S-C position, sta-tus, payload ops & data return, expected impact location & time.T-1h: Poll Astronomers – who is online, weather, conditions, etc.
T-10h: Begin comm: update on Centaur- S/S-C stack status & posi-tion, expected separa-tion time, expected im-pact location & time.
T-9h 50m: Confirmation of Centaur & S/S-C sepa-ration, update on Cen-taur- S/S-C stack status & position, updates re. impact location & time.
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 on-line.
T-10m – T-1: Updates every minute regarding Centaur & S/S-C posi-tion, status, expected impact location & time.
IMPACT
Centaur Separation
T-1m – T-0: Continuous updates regarding Cen-taur & S/S-C.
T-0: Confirmation of impact, indicate exact impact location.
T-0 – T+4: Real-time info re. S/S-C data. T+4 Confirmation of S/S-C impact.
T-0 T+1m T+2m T+3m T+4m T+1h T+2h
T-0 T+1m T+2m T+3m T+4m T+1h T+2h
T+4 – T+2h+: Comparison of S-S/C data with Astronomer observations.