Tycho crater impact_melt_deposits
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Transcript of Tycho crater impact_melt_deposits
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Lunar Reconnaissance Orbiter Camera (LROC) Exploring the Moon
LEAG 23 October 2012
Ryder crater
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LROC Status – Nominal Stats as of 21 October 2012
• >400 Gbits image data per day! • NAC
• 582,758 <91° incidence angle • 1.4E14 reflectance measures • Over time NACs could map
whole Moon at 0.5 to 2 m/p
• WAC • Thirty four complete global
datasets, each with unique lighting geometries
• 50 km orbit for 2.17 years, fantastic datasets!!! Two months of 25 km periapse…
• New Orbit… new opportunities
Enlargement of Apollo 11 landing site, from 25 km periapse. All Apollo sites imaged and Luna sites imaged from low orbits. As well as thousands of key science targets.
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NAC Dayside Coverage
Beta 0-45 noonish
Beta 45-80 sunset-rise Beta 0-80
LAT Range (-45 to 45) 43 % 46 % 70 %
LAT Range (-75 to 75) 50 % 54 % 76 %
Notes: Emission Angle <30° Until October 21, 2012
Think of beta angle as incidence angle at the equator
Very common question! How much NAC coverage do you have? Actually not a simple question!
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Tycho Crater Impact Melt Deposits
SE Flank Tycho
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Central crater 370 m diameter SE Flank Tycho Crater
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370 m diameter
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370 m diameter
700 m
75 m
Total drop 625/5500 m
22° max slope
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Raft is 300 m by 100 m
700 m
610 m
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370 m diameter
22° max slope
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NAC DEM: 20 m contours
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A
A
B
B
Lowest large flow front
NAC DEM
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990 m
1000 m
996 m
Upper level melt pond
400 m
NA
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Meanwhile on the north flank… image width about 6 km
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Cold Hearted Orb?
Surely you jest! The Moon is an incredibly inviting destination: esthetically, scientifically, and economically The Moon is a warm, friendly, and romantic world awaiting our return!