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Clementine ISAS



The Clementine Interstage Adapter Satellite (ISAS) was the lunar transfer booster used to propel the Clementine spacecraft to the Moon from Earth orbit. After boosting Clementine into a lunar transfer orbit, the ISAS was left in a highly elliptical (~300 x 127,000) Earth orbit with an inclination of 67 degrees. From this orbit the ISAS passed regularly through the Van Allen radiation belts and regions containing space debris, as well as interplanetary radiation and micrometeorite environments. To study these regions and to perform engineering studies to complement those aboard Clementine, the ISAS was equipped with an instrument pallet containing a number of experiments.

The Clementine ISAS consisted of a Thiokol Star 37FM solid rocket motor attached to an interstage adapter structure. The adapter was cylindrical and was wrapped with solar panels. The small instrument pallet with a mass of about 5 kg was attached to the inside adapter wall above the rocket motor. A simple transceiver system allowed communications with Earth. The adapter was spin-stabilized during the booster burn, but had no attitude control or determination.

The ISAS was equipped with three experiments which were also flown on the Clementine lunar orbiter. These were a radiation monitor, an instrument to determine damage coefficients of radiation-hard and -soft complemetary metal-oxide-semiconductor devices, and a dosimeter. Studies were also done on the radiation effects of types of devices flown on ISAS, including a linear charged coupled device (LCCD), an electrically erasable programmable read-only memory device (EEPROM), a field-programmable gate array (FPGA), and a static random access memory device (SRAM). Performance and calibration measurements were made of these devices throughout the flight to ascertain the effects of radiation. An orbiting meteorite and debris counter (OMDC) consisted of impact detectors which provided data on natural meteoroids and man-made debris in the near-Earth environment. Performance of other spacecraft systems was also monitored.

Alternate Names

  • 22987
  • Clementine Interstage Adapter Satellite
  • ClementineISAS

Facts in Brief

Launch Date: 1994-01-25
Launch Vehicle: Titan II-G
Launch Site: Vandenberg AFB, United States
Nominal Power: 100 W

Funding Agencies

  • NASA-Office of Space Science Applications (United States)
  • Department of Defense-Department of the Navy (United States)


  • Planetary Science
  • Space Physics
  • Technology Applications
  • Engineering

Additional Information

Questions and comments about this spacecraft can be directed to: Dr. David R. Williams



NameRoleOriginal AffiliationE-mail
Dr. Henry Berry GarrettProgram ManagerNASA Jet Propulsion
Lcol Pedro RustanMission ManagerUS Naval Research Laboratory

Selected References

  • Soli, G., et al., Clementine dosimetry, J. Spacecr. Rockets, 32, No. 6, 1065-1070, doi:10.2514/3.26732, Nov.-Dec. 1995.
  • Garrett, H. B., and P. Rustan, Clementine engineering experiments program, J. Spacecr. Rockets, 32, No. 6, 1045-1048, doi:10.2514/3.26728, Nov.-Dec. 1995.

More information on the Clementine mission, instruments, and early results can also be found in the Clementine special issue of Science magazine, Vol. 266, No. 5192, December 1994.

Clementine Flight Plan (1994)

January 25   Launch (16:34 UTC)
February 3   Leave Earth Orbit
February 5   First Earth Flyby
February 15  Second Earth Flyby
February 19  Enter Lunar Orbit
February 26  Start of Systematic Mapping - Cycle 1 (South)
March 26     End of Cycle 1, Start of Cycle 2 (North)
April 21     Completion of Cycle 2
May 5        Exit Lunar Orbit
(May 7        Computer Malfunction (14:39 UTC))
*May          Earth and Lunar Flybys
*June-August  Cruise to Geographos
*August 31    Geographos Flyby

* not accomplished due to malfunction

[Clementine Image of Aristarchus Crater]
Clementine color ratio composite image of Aristarchus Crater

Moon Home Page
Moon Fact Sheet

Clementine Images of the Moon
More Clementine Images

Clementine Data at the PDS Imaging Node
Gravity and Topography Data at the PDS Geosciences Node

Clementine 25th Anniversary - Naval Research Lab
A Clementine Collection - Naval Research Lab (PDF)
Clementine at the Lunar and Planetary Science Institute
Lessons Learned from the Clementine Mission (National Academy Press, 1997)

Detailed Clementine Information (PDS)

Clementine ISAS - Interstage Adapter Satellite

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