NASA Logo, National Aeronautics and Space Administration
NASA Space Science Data Coordinated Archive Header

X-Ray Proportional Counters

NSSDCA ID: 1985-048E-01

Mission Name: Spartan-A
Principal Investigator:Dr. Gilbert G. Fritz


This experiment consists of two large X-ray proportional counters equipped with collimators constructed from stacked, etched grids, plus aspect cameras, detector gas supply, and electronics. The photon energy range covers 0.5 to 15 keV. Because of alignment considerations, the collimators, aspect cameras, and the attitude control star tracker and gyro components are mounted on a common optical bench, which is attached to the spacecraft structure through kinematic mounts that eliminate flexing of the optical bench due to mechanical or thermal loads. The instrument has been flown numerous times on sounding rocket flights.

Alternate Names

  • Spartan-A/X-RayProportionalCounters


  • Solar Physics: X-Ray

Additional Information

Questions and comments about this experiment can be directed to: Dr. H. Kent Hills



NameRoleOriginal AffiliationE-mail
Dr. Gilbert G. FritzPrincipal InvestigatorUS Naval Research
[] NASA Logo -