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Preliminary Thermophysical Modeling of NEOWISE data on the Hayabusa2# Flyby Target 2001 CC21

Presentation #107.03 in the session Asteroids: Future Mission Targets (Oral Presentation)

Published onOct 23, 2023
Preliminary Thermophysical Modeling of NEOWISE data on the Hayabusa2# Flyby Target 2001 CC21

The Hayabusa2# flyby target 2001 CC21 has an uncertain size based on an uncertain albedo and uncertain absolute magnitude. We have collected all the NEOWISE observations of 2001 CC21 from November 2021 through February 2023, a total of 98 frames, and analyzed this data to estimate an infrared radiometric diameter. If NEOWISE continues to operate 2001 CC21 will be seen again later in 2023 and 2024 and this analysis can be improved. We analyze the multi-epoch 3.4 and 4.6 micron NEOWISE data using a rotating, cratered ThermoPhysical Model (TPM) to obtain estimates for the diameter, rotation pole, shape, and thermal inertia. 2001 CC21 is quite faint at 4.6 microns when 0.7 AU away from the Earth, and the resulting diameter is substantially smaller than the 700 m derived from the H magnitude and L spectral type. Recent polarimetric data has also suggested a smaller diameter, but not quite as small as the IR diameter. A fit to an ellipsoidal model gives a diameter of 329+78-41 meters [posterior median and central 68 percent confidence interval]. Prograde rotation is strongly preferred.

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