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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
(2017-Feb-26.53888507)
0.00010929 JED
period 1232.923821576616
3.38
9.4533e-06
2.588e-08
d
yr
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
(2014-Jan-23.49301687)
0.00031517 JED
period 1232.7969258828
3.38
4.8942e-05
1.34e-07
d
yr
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

Tuesday, November 17, 2015

421781 (2014 QG22) vs 53576 (2000 CS47)

These two asteroids are a potentially interesting couple.
I do not know if this couple is already known and if it is really a couple with a common origin.

Let's look at the JPL data, showing very similar orbital parameters:
421781 (2014 QG22)
Orbital Elements at Epoch 2457200.5 (2015-Jun-27.0) TDB
Reference: JPL 5 (heliocentric ecliptic J2000)

 Element Value Uncertainty (1-sigma)   Units 
e .1415490034245739 7.6497e-08
a 2.219666740174171 5.0262e-08 AU
q 1.905475125167845 1.6225e-07 AU
i 5.547751979163497 1.1933e-05 deg
node 270.894647775993 0.00023172 deg
peri 334.1685226014454 0.00025596 deg
M 170.5342535281013 0.00011344 deg
tp 2456628.311384753553
(2013-Dec-01.81138475)
0.00037629 JED
period 1207.897517520007
3.31
4.1027e-05
1.123e-07
d
yr
n .2980385295758646 1.0123e-08 deg/d
Q 2.533858355180498 5.7376e-08 AU
 Orbit Determination Parameters
   # obs. used (total)      49  
   data-arc span      3697 days (10.12 yr)  
   first obs. used      2004-08-14  
   last obs. used      2014-09-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .55494  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jan-08 13:35:22  

Additional Information
 Earth MOID = .893565 AU 
 T_jup = 3.631 

53576 (2000 CS47)
Orbital Elements at Epoch 2457200.5 (2015-Jun-27.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)

 Element Value Uncertainty (1-sigma)   Units 
e .1413172303277337 5.195e-08
a 2.219866104654218 1.5604e-08 AU
q 1.906160775046069 1.1284e-07 AU
i 5.548153406788004 6.1614e-06 deg
node 270.899183954788 6.9605e-05 deg
peri 334.2072656882382 7.5251e-05 deg
M 151.5995810376835 2.9164e-05 deg
tp 2456691.773809093385
(2014-Feb-03.27380909)
9.8063e-05 JED
period 1208.060256319952
3.31
1.2737e-05
3.487e-08
d
yr
n .2979983805581422 3.142e-09 deg/d
Q 2.533571434262367 1.7809e-08 AU

Orbit Determination Parameters
   # obs. used (total)      610  
   data-arc span      7436 days (20.36 yr)  
   first obs. used      1994-07-08  
   last obs. used      2014-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49974  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Mar-09 16:42:10  

Additional Information
 Earth MOID = .894238 AU 
 T_jup = 3.631 

 I tried to run the Mercury simulator (BS2 integrator, timestep 1 day) with the nominal parameters, with this result (graph done with the R package)



Kind Regards,
Alessandro Odasso

Sunday, November 15, 2015

2002 UP11 vs 2015 VF105

See update about this case:
https://groups.yahoo.com/neo/groups/mpml/conversations/messages/31516

=================================
2002 UP11 and 2015 VF105 have similar orbit parameters.
The uncertainty for 2015 VF105 is unknown and I do not find its observations.


Using the Mercury software, it seems that they had a relative close approach on May 8th, 2001 when their nominal relative distance and velocity were:
  • distance 0.00147 AU
  • velocity: ca 5 m/s
Maybe in the future, when further observations will be available, it will be possible to study them looking for a common origin

JPL Small-Body Database Browser:


(2002 UP11)
Classification: Mars-crossing Asteroid          SPK-ID: 3224224
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

[ show orbit diagram ]

Orbital Elements at Epoch 2457200.5 (2015-Jun-27.0) TDB
Reference: JPL 2 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .382955379120253 0.00010057
a 2.187589320416579 0.00042822 AU
q 1.349840222857032 4.6502e-05 AU
i 22.87063099452443 0.0044292 deg
node 43.70403288617293 0.0014051 deg
peri 62.82185003664876 0.00090087 deg
M 293.5443079306065 0.40392 deg
tp 2457418.660842947343
(2016-Jan-31.16084295)
1.39 JED
period 1181.808525581734
3.24
0.34701
0.0009501
d
yr
n .3046178735449497 8.9443e-05 deg/d
Q 3.025338417976127 0.0005922 AU
Orbit Determination Parameters
   # obs. used (total)      17  
   data-arc span      49 days  
   first obs. used      2002-10-04  
   last obs. used      2002-11-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      6  
   fit RMS      .53879  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-13 03:11:31  

Additional Information
 Earth MOID = .485591 AU 
 T_jup = 3.482 


(2015 VF105)
Classification: Mars-crossing Asteroid          SPK-ID: 3734494
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

[ show orbit diagram ]

Orbital Elements at Epoch 2457300.5 (2015-Oct-05.0) TDB
Reference: E2015-VE1 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 0.3831181 n/a
a 2.1883016 n/a AU
q 1.3499236 n/a AU
i 22.88002 n/a deg
node 43.69986 n/a deg
peri 62.82823 n/a deg
M 323.14568 n/a deg
tp 2457421.5445051
(2016-Feb-03.04450510)
n/a JED
period 1182.3857240
3.24
n/a
n/a
d
yr
n 0.30446917 n/a deg/d
Q 3.0266796 n/a AU
Orbit Determination Parameters
   # obs. used (total)      21  
   data-arc span      62 days  
   first obs. used      2015-09-11  
   last obs. used      2015-11-12  
   # oppositions      1  
   two-body model      T  
   fit RMS      0.13  
   data source      MPC:mp1  
   producer      MPCW  

Additional Information
 T_jup = 3.482 

Graph





Kind Regards,
Alessandro Odasso