Samiksha Jaiswal (Editor)

STEX

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Names
  
STEX USA 140 NROL-8

COSPAR ID
  
1998-055A

Launch mass
  
539.4 kg

Launch date
  
3 October 1998

Launch site
  
Vandenberg Air Force Base

Operator
  
NRO

SATCAT no.
  
25489

Launch mass
  
539.4 kg

Rocket
  
Minotaur-C

Manufacturer
  
Lockheed Martin

STEX httpsuploadwikimediaorgwikipediacommonsthu

Mission type
  
Technology demonstration

Similar
  
USA‑225, MightySat‑1, Student nitric oxid, Lacrosse, USA‑193

Space Technology Experiments, or STEX, also known as NRO Launch 8 or NROL-8, was an experimental NRO satellite built by Lockheed Martin. It was launched on October 3, 1998. One of the experiments was ATEx (Advanced Tether Experiment), which was deployed on 22. January 1999, and subsequently jettisoned.

ATEx

The Advanced Tether Experiment (ATEx), was a follow on to the TiPS experiment, designed and built by the Naval Center for Space Technology, flown as one of the experiments on STEX. ATEx had two end masses connected by a polyethylene tether that was intended to deploy to a length of 6 km in length, and was intended to test a new space tether deployment scheme, new tether material, active control, and survivability. ATEx was deployed on 16 January 1999 and ended 18 minutes later after deploying only 22 m of tether. The jettison was triggered by an automatic protection system designed to save STEX if the tether began to stray from its expected departure angle, which was ultimately caused by excessive slack tether, As a result of the deployment failure, none of the desired ATEx goals were achieved. ATEX is now tracked as a separate object as USA 141 or COSPAR ID 1998-055C.

References

STEX Wikipedia