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Neutral Gas Mass Spectrometer (ING)

NSSDCA ID: 1984-125A-06

Mission Name: Vega 1
Principal Investigator:Dr. Ehrhard Keppler


This investigation, known as NGE (neutral gas experiment) or ING, measured the elemental and isotopic compositions of the neutral gases in the coma. The instrument was comprised of two mass spectrometers. These were known as EIS and FIS, according to their ionization sources. The EIS had an electron impact source of ionization, followed by an electrostatic analyzer, and covered the mass range 1 to 28 u, with resolution of approximately 4%. The FIS had a field ionization source, followed by a time-of-flight velocity analyzer, and covered the mass range 1 to 80 u. Its resolution was a function of the mass.

Alternate Names

  • ING
  • Vega1/ING

Facts in Brief

Mass: 7 kg
Power (avg): 8 W
Bit rate (avg): 1.024 kbps


  • Planetary Science: Small Bodies
  • Planetary Science: Fields and Particles
  • Space Physics: Heliospheric Studies

Additional Information

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



NameRoleOriginal AffiliationE-mail
Dr. Ke-Chiang HsiehCo-InvestigatorUniversity of
Dr. Charles Y. FanCo-InvestigatorUniversity of Arizona
Prof. Donald M. HuntenCo-InvestigatorUniversity of
Dr. Charles C. CurtisCo-InvestigatorUniversity of
Dr. Ehrhard KepplerPrincipal InvestigatorMax-Planck-Institut fur
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