first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method S Tholen VIS Vilas 1992Icar..100...85V SPEC V Tholen VIS Binzel 1993Sci...260..186B SPEC V Tholen VIS Xu 1995Icar..115....1X SPEC V 0.990000 Mahlke VIS Mahlke 2022A&A...665A..26M SPEC