100416 Syang (1996 CB) - is it part of a cluster?

Orbital parameters: a e i om w (2014 PX11) 1.920100 0.1193356 17.32704 -40.72053 87.31196 100416 Syang (1996 CB) 1.920056 0.1196798 17.31632 -40.82830 87.34793 (2013 SJ104) 1.919897 0.1197210 17.32132 -40.70037 87.14390   ,

Thanks to Rob D. Matson for noting this:  "2016 CP39 is also similar, though not quite as close as the others are to each other."  Coming back to those three asteroids, I made a backward simulation with just a few clones going back about 278K years. The most interesting couple is 2013 SJ104 and 2014 PX11. Of course, this is not a proof. Kind Regards, Alessandro Odasso