S18B0056abst
S18B0056
Comets have been considered as one of the least-altered leftovers since the formation epoch of the Solar System. Two main ingredients of them are ice and dust, and the latter primarily consists of Mg-Fe silicate materials and of light elements of C, H, O, and N. Here we propose to make mid-Infrared Subaru/COMICS observations of comet 21P/Giacobini-Zinner (21P). 21P is an intriguing target since it has been considered as a prototypical carbon-chain depleted comet with its very fragile and fluffy dust structure. Such dust structure is highly vulnerable under the solar irradiation so that the existence of fluffy dust means 21P preserves its primitiveness to large extent. Therefore, understanding the origin and observed characteristics of 21P could enlighten the evolution of the carbon-chain depleted cometary materials in the Solar System. We aim to derive the peak intensity ratios of amorphous/crystalline olivine and pyroxene to constrain the natal temperature condition and origin of 21P materials. We would like to emphasize that this is the first systematic study of mineralogy of 21P silicates. If we miss this opportunity, we will be unable to encounter favorable observing geometry by 2031.
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