Link between the potentially hazardous Asteroid (86039) 1999 NC43 and the Chelyabinsk meteoroid tenuous

We explored the statistical and compositional link between Chelyabinsk meteoroid and potentially haz- ardous Asteroid (86039) 1999 NC43 to investigate their proposed relation proposed by Borovicka et al. (Borovicka, J., et al. (2013). Nature 503, 235-237). First, using a slightly more detailed computation we confirm that the orbit of the Chelyabinsk impactor is anomalously close to the Asteroid 1999 NC43. We find � (1-3) � 10 � 4 likelihood of that to happen by chance. Taking the standpoint that the Chelya- binsk impactor indeed separated from 1999 NC43 by a cratering or rotational fission event, we run a for- ward probability calculation, which is an independent statistical test. However, we find this scenario is unlikely at the � (10 � 3 -10