first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method C Bus VIS Binzel 2019Icar..324...41B SPEC C Bus VISNIR Binzel 2004Icar..170..259B SPEC V V 0.0513 0.0513 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT