first_spec_class second_spec_class prob_first_spec_class prob_second_spec_class taxonomy wavelength author ref method S-complex Bus-DeMeo NIR Binzel 2019Icar..324...41B SPEC S 0.990000 Mahlke VISNIR Mahlke 2022A&A...665A..26M SPEC Sq Q Bus-DeMeo NIR Perna 2016AJ....151...11P SPEC