Encyclopedia Astronautica
Lewis


American earth land resources satellite. One launch, 1997.08.23. Lewis was selected in the NASA SSTI (Small Spacecraft Technology Initiative) program, along with Clark, to demonstrate advanced spacecraft technologies.

The spacecraft was 3-axis stabilized, zero momentum biased control system with 0.004 deg knowledge. A single solar array generated 600 W power at 1 year. The hydrazine propulsion system had eight 1-lbf thrusters. System reliability was 0.86 at 5 years. The primary ground station was at TRW, Chantilly VA, with receive only stations at Univ. Alaska, Fairbanks, Stennis Space Centre, MS, HBCU network. Data was archived by the Stennis Space Centre, and accessible on the Internet or via a T1 line. The payload included :

  • Earth imaging Hyperspectral Imager (HSI) with 384 bands (0.4 - 2.5 Ám, 30 m pixels, 7.7 km swath, panchromatic: 0.45 - 0.75 Ám, 5 m pixels, 13 km swath)
  • Linear Etalon Imaging Spectral Array (LEISA), from NASA GSFC (1.0 - 2.5 Ám, 256 channels, 300 m pixels, 77 km swath)
  • Ultraviolet Cosmic Background (UCB), from UC Berkeley (35 - 85 nm)

In addition to the above instruments, several spacecraft systems technologies were flown. These included a pulse tube cryocooler, a solid state recorder, a fiber optic data bus, GPS attitude determination, a wide FOV star tracker, a magnetically suspended reaction wheel, lightweight structure with integrated thermal control, and a GFRP overwrapped propellant tank.

Contract start was 11 July 1994. Satellite cost was $ 65 million including the TRW hyperspectral sensor. Athena launch cost was $ 17 million. The launch was delayed from the original 23 May 1997 due to launch vehicle problems. After launch, the satellite was spinning out of control. It lost power due to the solar panels not recharging the batteries. It was declared a loss on 25 August 1997.

Electric System: 0.60 average kW.

Height: 1.77 m (5.80 ft).
First Launch: 1997.08.23.
Number: 1 .

More... - Chronology...


Associated Countries
See also
  • Athena Privately funded family of solid propellant satellite launch vehicles. Originally known as LMLV (Lockheed-Martin Launch Vehicle); LLV (Lockheed Launch Vehicle). Sales did not develop as hoped by the company after the MEO-satellite bubble burst in the 1990's. More...

Associated Launch Vehicles
  • Athena American orbital launch vehicle. Privately funded family of solid propellant satellite launch vehicles. Originally known as LMLV (Lockheed-Martin Launch Vehicle); LLV (Lockheed Launch Vehicle). Sales did not develop as hoped by the company after the MEO-satellite bubble burst in the 1990's. More...
  • Athena-1 American all-solid orbital launch vehicle. Basic version of the Athena with a Castor 120 first stage, Orbus second stage, and OAM Orbital Adjustment Module. More...

Associated Manufacturers and Agencies
  • NASA American agency overseeing development of rockets and spacecraft. National Aeronautics and Space Administration, USA, USA. More...
  • TRW American manufacturer of rockets, spacecraft, and rocket engines. TRW Corporation, Redondo Beach, CA, USA. More...

Bibliography
  • McDowell, Jonathan, Jonathan's Space Home Page (launch records), Harvard University, 1997-present. Web Address when accessed: here.
  • McDowell, Jonathan, Jonathan's Space Report (Internet Newsletter), Harvard University, Weekly, 1989 to Present. Web Address when accessed: here.
  • NASA GSFC Orbital Parameters,

Associated Launch Sites
  • Vandenberg Vandenberg Air Force Base is located on the Central Coast of California about 240 km northwest of Los Angeles. It is used for launches of unmanned government and commercial satellites into polar orbit and intercontinental ballistic missile test launches toward the Kwajalein Atoll. More...

Lewis Chronology


1994 July 11 - .
  • Contract for Lewis satellite issued. - . Nation: USA. Spacecraft: Lewis. Summary: Lewis was selected in the NASA SSTI (Small Spacecraft Technology Initiative) program, along with Clark, to demonstrate advanced spacecraft technologies..

1997 August 23 - . 06:51 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC6. LV Family: Athena. Launch Vehicle: Athena-1. LV Configuration: LMLV-1 LM-002.
  • Lewis - . Payload: SSTI/Lewis. Nation: USA. Agency: TRW; NASA. Manufacturer: Chantilly. Class: Earth. Type: Earth resources satellite. Spacecraft: Lewis. Decay Date: 1997-09-28 . USAF Sat Cat: 24909 . COSPAR: 1997-044A. Apogee: 134 km (83 mi). Perigee: 124 km (77 mi). Inclination: 97.5000 deg. Period: 87.10 min. Summary: Reentered Sep 28.

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