first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method V Tholen VIS Xu 1995Icar..115....1X SPEC Xk Bus VIS Bus 2002Icar..158..146B SPEC D Barucci-Tholen VIS Licandro 2008A&A...481..861L SPEC L 0.900000 Mahlke VIS Mahlke 2022A&A...665A..26M SPEC