first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method R Bus VIS Binzel 2019Icar..324...41B SPEC R Bus VISNIR Binzel 2004Icar..170..259B SPEC V R 0.560000 0.430000 Mahlke VIS Mahlke 2022A&A...665A..26M SPEC