Moon Mappers Data

(Special thanks to WSH Crew member Bill Wink for researching the data on these instruments!)

The images used in Moon Mappers were taken by the NASA’s Lunar Reconnaissance Orbiter. Here are the technical specifications for the instruments on the LRO.

Lunar Reconnaissance Orbiter

Lunar Reconnaissance Orbital Camera consists of two Narrow Angle Cameras (NACs) that are designed to iprovide 0.5 meter-scale panchromatic images over a 5 km swath, and a Wide Angle Camera (WAC) that provides images at a scale of 100 meters/pixel in seven color bands over a 60 km swath. The Sequence and Compressor System (SCS) supports data acquisition for both cameras.

Lunar Reconnaissance Orbiter Camera 1

LROC
Credits: NASA’s Goddard Space Flight Center/Debbie McCallum

Two narrow-angle cameras on the Lunar Reconnaissance Orbiter Camera (LROC) will make high-resolution, black-and-white images of the surface, capturing images of the poles with resolutions down to 1 meter (about 3.3 feet). A third, wide-angle camera(WAC), will take color and ultraviolet images over the complete lunar surface at 100-meter (almost 330-foot) resolution. These images will show polar lighting conditions, identify potential resources and hazards, and aid selection of safe landing sites. The Lunar Reconnaissance Orbiter Camera (LROC), developed at Arizona State University in Tempe.

Below are the listed specifications for both cameras.

Lunar Orbital Reconnaissance Camera Specs2

One Wide Angle Camera

Image format
  • 1024 x 14 pixels monochrome (push frame)
  • 704 x 14 pixels 5-filter (visible, push frame)
  • 128 x 4 2-filter UV color
Pixel Scale (nadir)
  • 1.50 milli-radian, 75 meters/pixel (visible)*
  • 7.67 milli-radian, 385 meters/pixel (UV, 4×4 binned)*
Image frame width (km)
  • 105 km (visible monochrome)*
  • 60 km (visible color)*
  • 57 km (UV)*
Optics
  • f/5.05 (visible)
  • f/5.65 (UV)
Effective FL
  • 6.0 mm (visible)
  • 4.7 mm (UV)
Entrance Pupil Diameter
  • 1.19 mm (visible)
  • 0.85 mm (UV)
FOV
  • 92° (monochrome)
  • 61° (visible)
  • 59° (UV)
System MTF (Nyquist) 0.37
Electronics 4 circuit boards
Detector Kodak KAI-1001
Pixel format 1024 x 1024
Noise 66±4 e−
Mass 0.9 kg
Volume (width × length × height) 15.8 cm x 23.2 cm x 32.3 cm (incl. radiator)
Peak Power 2.7 W
Average Power 2.6 W
Filters
  • #1 – 321 nm
  • #2 – 360 nm
  • #3 – 415 nm
  • #4 – 566 nm
  • #5 – 604 nm
  • #6 – 643 nm
  • #7 – 689 nm

*At an altitude of 50 km

Two Narrow Angle Cameras3

Pixel Scale 0.5 meter per pixel (10 micro-radian IFOV)*
Maximum Image size 2.5 x 26 km*
Optics f/3.59 Cassegrain (Ritchey-Chretien)
Effective FL 700 mm
Primary Mirror Diameter 195 mm
FOV 2.85° per NAC
MTF (Nyquist) > 0.23
Structure + baffle graphite-cyanate composite
Detector Kodak KLI-5001G
Pixel format 1 x 5,064
Noise 76 e-
A/D Converter Honeywell ADC9225
FPGA Actel RT54SX32-S
Mass 8.2 kg per NAC
Volume 70 cm x 27 cm diameter
Peak Power 9.3 W
Average Power 6.4 W
Sensitivity 400-750 nm
Voltage 28 V DC
Radiometric Accuracy 1% relative, 10% absolute
Detector Digitization 12-bit, encoded to 8-bit

*At an altitude of 50 km

 

The Lunar Reconnaissance Orbiter was originally designed to achieve the following measurement objectives4

  1. Find potential landing sites
  2. Map regions of permanent shadow or illumination
  3. Create high-resolution maps of polar massifs with permanent or near-permanent illumination
  4. Observe regions from multiple angles to derive high-resolution topography
  5. Improve maps of mineralogical components of the lunar crust
  6. Create a global morphology base map
  7. Characterize the regolith
  8. Determine impact hazards

Endnote references

  1.  http://lroc.sese.asu.edu/

 

The Lunar Reconnaissance Orbiter is currently in the Extended Mission phase, focused on collecting the data needed to address key lunar science questions, including:

1. Chronology/Bombardment
Determine bombardment history of the Moon, from the timing of basin-forming events down to small, recent impact events. Measure lunar landforms at 0.5 – 2.0 meter pixel scales for more than 10,000 targeted sites, and measure mineralogical variation of the Moon via ultraviolet-visible observations at sub-kilometer pixel scales over at least 75% of the surface.
2. Crustal Evolution
Investigate geological processes and their role in the evolution of the lunar crust and shallow lithosphere. This investigation includes imaging of landforms at 100m scale down to meter scale for thousands of targeted regions. Obtain oblique (more than 60° emission angle) imaging of key science targets for the purpose of assessing stratigraphy, at 2 meter pixel scales for an average of at least two targeted regions per month. Also, obtain UV/Visible (400 to 100 meter pixel scales) multi-phase angle imaging over at least 90% of the lunar surface and measure mineralogical variations of the Moon via ultraviolet-visible observations at sub-km pixel scale over a minimum of 75% of the lunar surface.
3. Regolith Evolution
Look for evidence of processes that shaped the global lunar regolith as they relate to evolution of the crust, verifying physical characteristics of the upper-most regolith layers via their textures, scattering mechanisms and composition. Measure the surface morphology at 0.5 – 2.0 meter scales, and other physical properties at meter pixel scale for specific targets.
4. Polar Volatiles
Investigate volatile sources, sinks and transfer mechanisms with emphasis on the lunar polar regions, including permanently shadowed regions (PSRs). Measure polar region landforms in PSRs at better than 20 meter horizontal scales. Also, measure reflectivity as a function of phase angle at meter and 100 meter scales near PSRs within 10° of each pole.

 

 

 

 

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