first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method D Tholen VIS Dahlgren 1995A&A...302..907D SPEC D Tholen VIS Dahlgren 1995A&A...302..907D SPEC K 0.356 Bus-Demeo VIS Sergeyev 2022A&A...658A.109S PHOT