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 0.968 Bus-Demeo VIS Sergeyev 2022A&A...658A.109S PHOT S Q 0.880000 0.120000 Mahlke VIS Mahlke 2022A&A...665A..26M SPEC