IRTF Data Archive Program Information

# # Program information file # PROGRAM_ID 2023A066 PROGRAM_TITLE Mineralogy of the Hayabusa2 extended mission target asteroid [98943] 2001 CC21 PROGRAM_INV1 Eri Tatsumi PROGRAM_INV2 Marcel Popescu PROGRAM_INV3 Javier Licandro PROGRAM_INV4 Julia de Leon PROGRAM_INV5 PROGRAM_SCICAT near-Earth objects PROGRAM_ABSTRACT_BEG We observe the Hayabusa2 extended mission fly-by target, a near-Earth asteroid [98943] 2001 CC21. This asteroid will have the best observation window in the beginning of February 2023, when the target will have the apparent magnitude of 15-16. According to the previous observations, we have known that the rotational period is about 5 hours and this asteroid is probably a silicate-rich asteroid. However, the reflectance spectral shape may vary by rotational phases. Thus, we would like to observe this target for 6 hours for 3 nights with different rotational phases. SpeX, in the low resolution prism mode, is the ideal instrument to observe the broad, silicate associated features at 1- and 2-microns. Using the SpeX data, we will apply the compositional models in order to estimate the mineralogies in different rotational phases. Since Hayabusa2 can only observe one specific rotational phase, this observation will be extremely important to design the mission operation. We also will try to observe this target with another telescope to obtain complementary information, such as visible photometric properties and shape, for this asteroid. PROGRAM_ABSTRACT_END