Crystallinity and temperature of icy grains in comet C/2002 T7 (LINEAR)

Hideyo Kawakita, Takafumi Ootsubo, Reiko Furusho, Jun ichi Watanabe

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We discuss the crystallinity and the temperature of water ice grains in the coma of comet C/2002 T7 (LINEAR) at 3.5 AU from the Sun. The observed relative reflectance spectrum in J and H bands can be reproduced by using the Hapke's model. Due to limited S/N ratios of the observed spectrum, however, we can not identify the phase (crystalline or amorphous states) of water ice. Both crystalline and amorphous water ices can explain the observed spectrum within the errors. If the water ice was in amorphous state, the cometary ices formed and/or condensed in the molecular cloud or in the solar nebula (at further than 25 AU from the Sun). In contrast, if the cometary water ice was in crystalline state, the temperature of the icy grains in the coma could be estimated to be about 140-170 K, which is consistent with the temperature of sublimating dirty water ice grains at 3.5 AU.

Original languageEnglish
Pages (from-to)1968-1971
Number of pages4
JournalAdvances in Space Research
Issue number9
Publication statusPublished - 2006
Externally publishedYes


  • Comet
  • Crystallinity
  • Interstellar ice
  • Molecular cloud
  • Solar nebula
  • Solar system
  • Water ice

ASJC Scopus subject areas

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences(all)


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