first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method S Tholen VIS Xu 1995Icar..115....1X SPEC S 1.000000 Mahlke VISNIR Mahlke 2022A&A...665A..26M SPEC S S Movis NIR Popescu 2018A&A...617A..12P PHOT