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Lewis satellite

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Lewis Credit: Manufacturer Image

AKA: Lewis;SSTI. Status: Operational 1997. First Launch: 1997-08-23. Last Launch: 1997-08-23. Number: 1 . Gross mass: 288 kg (634 lb). Height: 1.77 m (5.80 ft).

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 µm, 30 m pixels, 7.7 km swath, panchromatic: 0.45 - 0.75 µm, 5 m pixels, 13 km swath)
• Linear Etalon Imaging Spectral Array (LEISA), from NASA GSFC (1.0 - 2.5 µm, 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.

• Contract for Lewis satellite issued. - . Nation: USA. Spacecraft Bus: T200. Spacecraft: Lewis satellite. Lewis was selected in the NASA SSTI (Small Spacecraft Technology Initiative) program, along with Clark, to demonstrate advanced spacecraft technologies..

• Lewis - . Payload: SSTI/Lewis. Nation: USA. Agency: NASA, TRW. Manufacturer: Chantilly. Class: Earth. Type: Earth resources satellite. Spacecraft Bus: T200. Spacecraft: Lewis satellite. Decay Date: 1997-09-28 . USAF Sat Cat: 24909 . COSPAR: 1997-044A. Apogee: 134 km (83 mi). Perigee: 124 km (77 mi). Inclination: 97.50 deg. Period: 87.10 min. Reentered Sep 28.