first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method S Bus VIS Binzel 2019Icar..324...41B SPEC S Bus VIS Bus 2002Icar..158..146B SPEC S 0.940000 Mahlke VIS Mahlke 2022A&A...665A..26M SPEC S S Movis NIR Popescu 2018A&A...617A..12P PHOT