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Tuesday, November 24, 2015

11842 Kap'bos (1987 BR1) vs 436415 (2011 AW46)

11842 Kap'bos (1987 BR1) is an interesting asteroid indeed!

First of all, looking at proper elements (see this page), this asteroid has already been recognized to be associated to (228747) 2002 VH3

Furthermore, but this is not sure, it may be even more strictly associated to 436415 (2011 AW46)

JPL Small-Body Database Browser

11842 Kap'bos (1987 BR1)
Orbital Elements at Epoch 2457200.5 (2015-Jun-27.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)

 Element Value Uncertainty (1-sigma)   Units 
e .09426143976452217 5.4457e-08  
a 2.250221196226988 1.1502e-08 AU
q 2.038112106481987 1.1993e-07 AU
i 3.688461615022471 5.8652e-06 deg
node 272.8444791596755 7.5115e-05 deg
peri 172.3596586176659 8.1653e-05 deg
M 181.7294574254017 3.145e-05 deg
tp 2457811.038885071140
0.00010929 JED
period 1232.923821576616
n .2919888428626886 2.2388e-09 deg/d
Q 2.462330285971989 1.2586e-08 AU

436415 (2011 AW46) 
Orbital Elements at Epoch 2457200.5 (2015-Jun-27.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)

 Element Value Uncertainty (1-sigma)   Units 
e .09435201650783409 1.8231e-07  
a 2.25006679453928 5.9552e-08 AU
q 2.03776845519718 4.095e-07 AU
i 3.688904837606787 1.5844e-05 deg
node 272.8087674388969 0.00022201 deg
peri 172.3636156199904 0.0002396 deg
M 151.7058568204286 9.5288e-05 deg
tp 2456680.993016870443
0.00031517 JED
period 1232.7969258828
n .2920188981994789 1.1593e-08 deg/d
Q 2.462365133881379 6.5171e-08 AU

This is the result of a simulation made with Mercury6 software (graphs made with package R):

Looking at nominal parameters, it seems that these two asteroids had a very close encounter (nearly 9000 km) with a relative velocity of about 30 cm/s about 11500 years ago.

I do not know whether this is true and, if yes, whether this is just a coincidence or these two asteroids separated in that moment from a common body.

Kind Regards,
Alessandro Odasso

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