This object made a close approach to Earth when it was discovered in 2005 and will do so again in 2045. This object has a poorly known orbit and was only observed over an observation arc of 17 days, not sufficient to predict its position in 1908 with sufficient accuracy.
- "JPL Small-Body Database Browser: (2005 NB56)". 2005-07-28 last obs. Retrieved 2009-05-19.
- When Comets Attack: Solving the Mystery of the Biggest Natural Explosion in Modern History, By Mark Anderson, Popular Mechanics
- "NEODyS: 2005NB56". Department of Mathematics, University of Pisa, ITALY. Retrieved 2009-05-19.