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JPL Small-Body Database Browser
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(2012 US18)
Classification: Apollo [NEO]          SPK-ID: 3612646
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ hide orbit diagram ]

For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 6 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3552721017662898 0.001102  
a 1.193935311108728 0.0014841 au
q .769763403758141 0.00035891 au
i 3.541434765299278 0.009263 deg
node 205.4080559428157 0.016142 deg
peri 266.1162270849107 0.015056 deg
M 193.3745087060317 2.5946 deg
tp 2459617.050762847975
(2022-Feb-06.55076285)
3.8455 TDB
period 476.5073699629373
1.30
0.88846
0.002432
d
yr
n .7554972340259937 0.0014086 deg/d
Q 1.618107218459315 0.0020113 au
  Orbit Determination Parameters
   # obs. used (total)      25  
   data-arc span      3 days  
   first obs. used      2012-10-18  
   last obs. used      2012-10-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      7  
   norm. resid. RMS      .39111  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 06:59:50  

Additional Information
 Earth MOID = .00411757 au 
 Jupiter MOID = 3.50352 au 
 T_jup = 5.252 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456219.5 (2012-Oct-19.0) TDB
Reference: JPL 6 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3543284860721961 0.00076388  
q .7686998691879607 0.00036077 au
tp 2456281.604313332112
(2012-Dec-20.10431333)
0.037243 TDB
node 205.8202411377279 0.00017061 deg
peri 266.0003126599075 0.00038489 deg
i 3.770531700329159 0.0083164 deg
  Orbit Determination Parameters
   # obs. used (total)      25  
   data-arc span      3 days  
   first obs. used      2012-10-18  
   last obs. used      2012-10-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      7  
   norm. resid. RMS      .39111  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 06:59:50  

Additional Information
 Jupiter MOID = 3.50352 au 
 T_jup = 5.252 
Orbit Covariance (6×6)
  e q tp node peri i
e 5.835161481339707E-7 -2.755843674237552E-7 -2.844884720897517E-5 -1.297313078810296E-7 7.099166523809353E-8 6.350774731086425E-6
q -2.755843674237552E-7 1.301556945327062E-7 1.343560561036621E-5 6.127694556476178E-8 -3.405270695033853E-8 -2.999522770993266E-6
tp -2.844884720897517E-5 1.343560561036621E-5 .00138704420938642 6.323411760551864E-6 -3.383594302416412E-6 -.0003095920239575104
node -1.297313078810296E-7 6.127694556476178E-8 6.323411760551864E-6 2.91092936332978E-8 -1.836316829830843E-8 -1.413485892630966E-6
peri 7.099166523809353E-8 -3.405270695033853E-8 -3.383594302416412E-6 -1.836316829830843E-8 1.4813997250064E-7 8.269435207954376E-7
i 6.350774731086425E-6 -2.999522770993266E-6 -.0003095920239575104 -1.413485892630966E-6 8.269435207954376E-7 6.916223844421733E-5

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 28.6   n/a MPO240175  

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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