Bannister, M.T.; Schwamb, M.E. (2017). “Col-OSSOS: Colors of the Interstellar Planetesimal 1I/2017 U1 in Context with the Solar System”. The Astrophysical Journal851 (2): L38. arXiv:1711.06214. Bibcode: 2017ApJ...851L..38B. doi:10.3847/2041-8213/aaa07c. "As its albedo is unknown, we do not describe 1I/ʻOumuamua as consistent with Tholen (1984) P type."
Bannister, M.T.; Schwamb, M.E. (2017). “Col-OSSOS: Colors of the Interstellar Planetesimal 1I/2017 U1 in Context with the Solar System”. The Astrophysical Journal851 (2): L38. arXiv:1711.06214. Bibcode: 2017ApJ...851L..38B. doi:10.3847/2041-8213/aaa07c. "As its albedo is unknown, we do not describe 1I/ʻOumuamua as consistent with Tholen (1984) P type."
Bannister, M.T.; Schwamb, M.E. (2017). “Col-OSSOS: Colors of the Interstellar Planetesimal 1I/2017 U1 in Context with the Solar System”. The Astrophysical Journal851 (2): L38. arXiv:1711.06214. Bibcode: 2017ApJ...851L..38B. doi:10.3847/2041-8213/aaa07c. "As its albedo is unknown, we do not describe 1I/ʻOumuamua as consistent with Tholen (1984) P type."