Fig. 12

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NEO orbital distribution with ephemeris taken from NASA Horizons with clusters identified, objects not belonging to a cluster can be seen as small gray points. The background heatmap, however, indicates the observational bias of the NEO dataset. The red regions denote orbits for which more objects exist in the NEO database relative to the debiased dataset of Granvik et al. (2018), and blue is where there exists a deficit of NEO detections. Clusters identified by Jopek (2020) can be seen as large dark gray points. The clusters identified within this study are colored, each with at least 5 members. They were identified using a DBSCAN algorithm where core points were defined as having at least two associations with a minimum ϵ corresponding to DH value of 0.03. This D value was chosen as it corresponds well to where the cumulative D-value distribution displays a “kink” corresponding to an excess of similarity. The points that were also identified by Jopek (2020) as being in a cluster have a black border. The new large yellow cluster identified is not asteroidal but corresponds to all the fragments of 73P/Schwassmann-Wachmann, which was a Jupiter-family comet observed to have undergone significant fragmentation between 1995 and 2006 (Reach et al. 2009).
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