Optical System
- f/3.4, five element refractor
- FOV 3 x 2.25 degrees
- Eight position filter wheel
CCD Focal Plane Unit
- 0.4 - 1.0 µ spectral range
- 244 x 550 px format (244 x 537 used)
- 16 x 27 µ pixels, 161 x 95 µr resolution
- 1 sec frame rate
- 10 ms to 1 sec exposure, electronic shutter
- Operating temperature: -40C to -30 C (noise less than 150 e-/px)
- Spectral range ~0.8-2.6 µ, covered in 62 spectral channels
- Spectral channels are spatially co-registered
- Spectrum dispersed onto Ge and InGaAs line array detectors
- S/N greater than 200
- Operating temperature less than - 30 C
- Instrument includes a 1-D scan mirror FOV can be boresighted with imager
or scanned greater than 90 degrees away
- Slit IFOV 0.38 x 0.76 degrees
Multispectral Imager/Near-Infrared Spectrograph
Instrument Scientist: Scott L. Murchie
Science Team:
Joseph Veverka (Team Leader), Cornell University, Ithaca, N.Y.
James F. Bell III, NASA Ames Research Center, Mountain View, Calif.
Clark R. Chapman, Planetary Science Institute, Tucson, Ariz.
Michael C. Malin, Malin Space Science Systems, Inc., San Diego, Calif.
Lucy-Ann A. McFadden, University of Maryland, College Park, Md.
Mark S. Robinson, U.S. Geological Survey, Flagstaff, Ariz.
Peter C. Thomas, Cornell University
X-Ray Fluorescence (XRF)
- The XRF detectors are three gas proportional counters collimated to
5 degrees FOV, observing X-ray line emissions from the asteroid.
- Balanced filters are used to separate Si, Al, Mg.
- Detectors resolve Fe, S, Ca lines.
- XRF includes a separate solar monitor.
Gamma Ray Spectrometer (GRS)
- Shielded NaI scintillator GRS is body-mounted and will measure radioactive
elements (e.g. U, K, Th) plus other important elements (e.g. H, Fe, Mg, Si).
X-Ray/Gamma-Ray Spectrometer
Instrument Scientist: Ralph L. McNutt
Science Team:
Jacob I. Trombka (Team Leader), NASA Goddard Space Flight Center,
Greenbelt, Md.
William V. Boynton, University of Arizona, Tucson
Johannes Bruckner, Max Planck Institut fur Chemie, Mainz, Germany
Steven W. Squyres, Cornell University
- Three-axis fluxgate sensor on the feed of the high-gain antenna
- Eight ranges: Full scale, 6 nT to 100,000 nT Resolution, 16 bit
- Outputs, once per second: DC field Bandpassed AC, 1.0 to 10.0 Hz
- System sensitivity: less than 5 nT (local field)
- Asteroid surface field to be measured to 40 nT using asteroid
rotation and spacecraft orbital motion
Magnetometer
Instrument Scientist: Larry J. Zanetti
Science Team:
Mario H. Acuna, Goddard Space Flight Center (Team Leader)
Christopher T. Russell, University of California, Los Angeles
- Fixed mount on spacecraft and bore-sighted with imager
- Diode pumped, Nd:YAG laser transmitter at 1.064 µm
- Direct, incoherent detection with enhanced Si APD
- Range measurements at 1/sec
- Maximum range 50 km
- Range accuracy 6 m
- Beam divergence less than 400 µr
Laser Altimeter
Instrument Scientist: Andrew F. Cheng
Science Team:
Maria T. Zuber (Team Leader), Goddard Space Flight Center
Radio Science
Science Team:
Donald K. Yeomans (Team Leader), NASA Jet Propulsion Laboratory
Pasadena, Calif.
Jean-Pierre Barriot, Centre National D'Etudes Spatiales, Toulouse,
France
Alexander S. Konopoliv, Jet Propulsion Laboratory
One 34m pass/day Three 34m passes/day Instrument Example 1 Example 2 Example 3 Example 4 __________________________________________________________________ Imager 1500 650 5300 4650 IR 50 800 200 800 XR 200 250 250 250 GRS 100 150 150 150 MAG 50 50 50 50 LIDAR 50 50 0 50 S/C HK 50 50 50 50 __________________________________________________________________ TOTAL 2000 2000 6000 6000 Units are daily average bits per secondInstrument information courtesy of Andrew F. Cheng, Project Scientist, andrew_cheng@jhuapl.edu