Thermal infrared and optical photometry of Asteroidal Comet C/2002 CE10

Sekiguchi, Tomohiko; Miyasaka, Seidai; Dermawan, Budi; Mueller, Thomas; Takato, Naruhisa; Watanabe, Junichi; Böhnhardt, Hermann

doi:10.1016/j.icarus.2017.12.037

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Thermal infrared and optical photometry of Asteroidal Comet C/2002 CE₁₀

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Böhnhardt, Hermann
MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society;
Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society;

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引用

Sekiguchi, T., Miyasaka, S., Dermawan, B., Mueller, T., Takato, N., Watanabe, J., & Böhnhardt, H. (2018). Thermal infrared and optical photometry of Asteroidal Comet C/2002 CE₁₀. Icarus, 304, 95-100. doi:10.1016/j.icarus.2017.12.037.

引用: https://hdl.handle.net/21.11116/0000-0000-BA8C-1

要旨

C/2002 CE₁₀ is an object in a retrograde elliptical orbit with Tisserand parameter -0.853 indicating a likely origin in the Oort Cloud. It appears to be a rather inactive comet since no coma and only a very weak tail was detected during the past perihelion passage. We present multi-color optical photometry, lightcurve and thermal mid-IR observations of the asteroidal comet. With the photometric analysis in BVRI, the surface color is found to be redder than asteroids, corresponding to cometary nuclei and TNOs/Centaurs. The time-resolved differential photometry supports a rotation period of 8.19  ±  0.05 h. The effective diameter and the geometric albedo are 17.9  ±  0.9 km and 0.03  ±  0.01, respectively, indicating a very dark reflectance of the surface. The dark and redder surface color of C/2002 CE₁₀ may be attribute to devolatilized material by surface aging suffered from the irradiation by cosmic rays or from impact by dust particles in the Oort Cloud. Alternatively, C/2002 CE₁₀ was formed of very dark refractory material originally like a rocky planetesimal. In both cases, this object lacks ices (on the surface at least). The dynamical and known physical characteristics of C/2002 CE₁₀ are best compatible with those of the Damocloids population in the Solar System, that appear to be exhaust cometary nucleus in Halley-type orbits. The study of physical properties of rocky Oort cloud objects may give us a key for the formation of the Oort cloud and the solar system.