Results of Photometric Observations of Comet P/2019 LD2 at the Sanglokh Observatory

Igneous processes in the small bodies of the Solar System I. Asteroids and comets

“… 224 The distribution of these comets is quite heterogeneous, aside the Halley-type and Encke-type comets some of them belong to the Jupiter-family, others (i.e. P/2019 LD2 225 ) are transiting from Centaur group to Jupiter-family, and others to the Oort cloud family, thus implying that the igneous processes producing the crystalline olivine were well distributed along the original places where the comets formed. This in the case that crystalline olivine is formed by thermal annealing of amorphous ferromagnesian silicate under vacuum at temperatures of 870 K–1020 K. 226 In such a case, if we want to understand whether the igneous processes that formed the olivine actually occurred in the original place of formation of the comets or not, it is very important to know where the comets and the olivine present in their nuclei formed.…”