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EO 1

Also called Earth Orbiter 1 or Earth Observing 1


Designation 26619 / 00075A
Launch date 21 Nov 2000
Country of origin United States
Mission Remote sensing
Operator NASA
Perigee/Apogee 705 km sun synchronous (10:01 AM descending)
Inclination 98.2°
Period 99 min
Launch vehicle Delta 2 #282

The first of three New Millennium Program Earth orbiting missions. EO 1 is an advanced land imaging mission that will demonstrate new instruments and spacecraft systems. EO 1 will validate technologies contributing to the reduction in cost of follow-on Landsat missions. The centerpiece of this mission is the Advanced Land Imager (ALI) instrument, which is one seventh the mass, power consumption and volume of the Landsat 7 imager.

It will match within one minute the Landsat 7 orbit and collect identical images for later comparison.

The Pulsed Plasma Thrusters aboard successfully performed attitude control tasks, demonstrating the usefulness of the technology.

End of life

Out of service planned in 2017

External resources


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Technical data


Prime contractor Swales Aerospace
Platform ATK A200
Mass at launch 572 kg
Mass in orbit  
Dry mass 370 kg
Payload mass 90 kg
Dimension 1.25m across flats, 0.73m high -hexagonal right prism)
Solar array  
Stabilization 3-axis
DC power EOL: 600 W (experiment needs: 80 W)
Design lifetime 5 years

Has a GPS receiver for navigation and timeming. 44 Gbit record. Downlink in X-band at 105 Mbps (XPAA) with a backup in S-band at 2 Mbps.

ALI (Advanced Land Imager)

The ALI instrument will feature ten-meter ground resolution in the panchromatic (black-and-white) band and 30-meter ground resolution in its other spectral bands (0.4-2.4 microns), using a four-chip multispectral focal plane array that covers seven of the eight bands of the current Landsat.

AC (Atmospheric Corrector)

The instrument will provide the first space-based test of an Atmospheric Corrector for increasing the accuracy of surface reflectance estimates. The AC enables more precise predictive models to be constructed for remote sensing applications. It will provide significant improvements in generating accurate reflectance measurements for land imaging missions. Covers the 0.890-1.600 micron wavelength IR band.


The Hyperion provides a science grade instrument with quality calibration based on heritage from the Lewis Hyperspectral Imaging Instrument. The Hyperion capabilities provide resolution of surface properties into hundreds of spectral bands versus the ten multispectral bands flown on traditional Landsat imaging missions. Through this large number of spectral bands, complex land eco-systems shall be imaged and accurately classified. The Hyperion provides a high-resolution hyperspectral imager and can image detailed spectral mapping across all 220 channels with high radiometric accuracy. It covers the .4-2.5 micron wavelengths atn a resolution of 30 m.

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