first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method B Bus-DeMeo VISNIR Hasegawa 2024AJ....167..224H SPEC Cg Bus VIS Bus 2002Icar..158..146B SPEC S S Movis NIR Popescu 2018A&A...617A..12P PHOT