Bolin, B.T. et al. (2017). "APO Time Resolved Color Photometry of Highly-Elongated Interstellar Object 1I/ʻOumuamua". The Astrophysical Journal852 (1): L2. doi:10.3847/2041-8213/aaa0c9. Bibcode: 2018ApJ...852L...2B.
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. doi:10.3847/2041-8213/aaa07c. Bibcode: 2017ApJ...851L..38B. "As its albedo is unknown, we do not describe 1I/‘Oumuamua as consistent with Tholen (1984) P type.".
Feng, F.; Jones, H.R.A. (23 November 2017). "ʻOumuamua as a messenger from the Local Association". The Astrophysical Journal852 (2): L27. doi:10.3847/2041-8213/aaa404. Bibcode: 2018ApJ...852L..27F.
Ćuk, Matija (19 December 2017). "1I/ʻOumuamua as a Tidal Disruption Fragment From a Binary Star System". The Astrophysical Journal852 (1): L15. doi:10.3847/2041-8213/aaa3db. Bibcode: 2018ApJ...852L..15C.
Bolin, B.T. et al. (2017). "APO Time Resolved Color Photometry of Highly-Elongated Interstellar Object 1I/ʻOumuamua". The Astrophysical Journal852 (1): L2. doi:10.3847/2041-8213/aaa0c9. Bibcode: 2018ApJ...852L...2B.
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. doi:10.3847/2041-8213/aaa07c. Bibcode: 2017ApJ...851L..38B. "As its albedo is unknown, we do not describe 1I/‘Oumuamua as consistent with Tholen (1984) P type.".
Feng, F.; Jones, H.R.A. (23 November 2017). "ʻOumuamua as a messenger from the Local Association". The Astrophysical Journal852 (2): L27. doi:10.3847/2041-8213/aaa404. Bibcode: 2018ApJ...852L..27F.
Ćuk, Matija (19 December 2017). "1I/ʻOumuamua as a Tidal Disruption Fragment From a Binary Star System". The Astrophysical Journal852 (1): L15. doi:10.3847/2041-8213/aaa3db. Bibcode: 2018ApJ...852L..15C.
The solar escape velocity from Earth's orbit (1 AU from the Sun) is 42.1 km/s. For comparison, even 1P/Halley moves at 41.5 km/s when 1 AU from the Sun, according to the formula v = 42.1219 √1/r − 0.5/a, where r is the distance from the Sun, and a is the major semi-axis. Near-Earth asteroid 2062 Aten only moves at 29 km/s when 1 AU from the Sun because of the much smaller major semi-axis.