first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method S Bus VIS Bus 2002Icar..158..146B SPEC S Q 0.890000 0.100000 Mahlke VIS Mahlke 2022A&A...665A..26M SPEC S S 0.8481 0.8481 Bus-Demeo VIS Sergeyev 2021A&A...652A..59S PHOT