first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method S Tholen VIS Lazzaro 2004Icar..172..179L SPEC S L 0.840000 0.160000 Mahlke VIS Mahlke 2022A&A...665A..26M SPEC SI Bus VIS Lazzaro 2004Icar..172..179L SPEC