First statistical analysis of 5000 mass spectra of cometary grains obtained by PUMA 1 (Vega 1) and PIA (Giotto) impact ionization mass spectrometers in the compressed modes

Details First statistical analysis of 5000 mass spectra of cometary grains obtained by PUMA 1 (Vega 1) and PIA (Giotto) impact ionization mass spectrometers in the compressed modes First statistical analysis of 5000 mass spectra of cometary grains obtained by PUMA 1 (Vega 1) and PIA (Giotto) impact ionization mass spectrometers in the compressed modes

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..761l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 187, no. 1-2, Nov. 1987, p. 761-766.

Astronomy and Astrophysics

Astrophysics

46

Chemical Composition, Comet Tails, Cosmic Dust, Light Elements, Mass Spectra, Statistical Analysis, Chondrites, Giotto Mission, Time Dependence, Vega Project

Scientific paper

Impact ionization mass spectrometers have been flown on board the space vehicles Giotto (instrument PIA), Vega 1 and Vega 2 (instruments PUMA 1 and 2). All three instruments obtained a large collection of mass spectra of individual cometary dust particles in the mass range 3×10-16 - 3×10-10g. Spectra from PUMA 2 are still being recovered from data transmission problems, and only results from PUMA 1 and PIA are presented. A large fraction of particles (≡30%) are dominated by light elements (H, C, O, and N, or "CHON"). Approximately 35% of particles can be interpreted as minerals with a compositional range similar to that encountered in carbonaceous chondrites. The remaining 35% appear to be mixtures in varying amounts of these two major components. Statistically significant variations have been observed as a function of time.

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