first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method O Bus VISNIR Binzel 2004Icar..170..259B SPEC Q 0.960000 Mahlke VISNIR Mahlke 2022A&A...665A..26M SPEC S-complex Bus-DeMeo NIR Binzel 2019Icar..324...41B SPEC