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EO 1



EO 1 (Earth Observing mission 1) is the first spacecraft in the American New Millennium Program (NMP) and was launched by a Delta 2 rocket from Vandenberg AFB at 13:24 UT. The 573 kg spacecraft carries three well-developed instruments (and seven technology-test items) to image Earth's surface in numerous wavelength bands. The Hyperion is a grating-imaging spectrometer and will image the surface in 220 spectral bands covering 0.4-2.5 micron wavelengths at a resolution of 30 meters. It is expected to provide better crop estimates, and better mineral resource areas than are being provided by Landsat 7. The Advanced Land Imager (ALI) is a wide field (15 deg x 1.26 deg) reflective optics telescope that will provide images in 10 wavelength bands covering 0.4-2.4 microns with a spatial resolution of 30 meters. It is designed to produce images that are directly comparable to the ones from the ETM+ (Enhanced Thematic Mapper Plus) instrument on board Landsat 7, and thus provide continuity of data. The third instrument, LAC (LEISA Atmospheric Corrector) covers the 0.890-1.600 micron wavelength IR band by means of a wedged etalon filter and three arrays (256 x 256) of In-Ga detectors, each array covering a five deg swath width with a spatial resolution of 250 meters. It will aid in correcting the data from the other instruments for water vapor and cirrus cloud variations. Among the new technology test/demonstration items is the XPAA (X-band Phased Array Antenna) with 64 elements powered by a 160 W transmitter that sends data at a rate of 105 MB per second.

Alternate Names

  • 26619
  • EO1
  • Earth Observing mission 1

Facts in Brief

Launch Date: 2000-11-21
Launch Vehicle: Delta II
Launch Site: Vandenberg AFB, United States
Mass: 573 kg

Funding Agency

  • National Aeronautics and Space Administration (United States)


  • Earth Science

Additional Information

Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office

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