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(2018 XC4)
Classification: Apollo [NEO]          SPK-ID: 3836892
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 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3105169950410485 2.0113e-06  
a 1.2677653237652 4.2113e-06 au
q .8741026450123884 8.1231e-07 au
i 2.170933014792021 5.3522e-05 deg
node 95.08363360198696 0.00044341 deg
peri 52.41316934618461 0.00067264 deg
M 245.3388433157763 0.002896 deg
tp 2459562.562108414435
(2021-Dec-14.06210841)
0.0050217 TDB
period 521.3828358093122
1.43
0.0025979
7.113e-06
d
yr
n .690471521643387 3.4405e-06 deg/d
Q 1.661428002518012 5.519e-06 au
  Orbit Determination Parameters
   # obs. used (total)      68  
   # delay obs. used      0  
   # Doppler obs. used      1  
   data-arc span      6 days  
   first obs. used      2018-12-13  
   last obs. used      2018-12-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      4  
   norm. resid. RMS      .40516  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 20:56:04  

Additional Information
 Earth MOID = .0034806 au 
 Jupiter MOID = 3.3429 au 
 T_jup = 5.042 
[ hide covariance matrix ]
Orbital Elements at Epoch 2458467.5 (2018-Dec-15.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3146594853575569 1.8767e-06  
q .8764775108646861 7.4779e-07 au
tp 2458519.026854604479
(2019-Feb-04.52685460)
0.00014714 TDB
node 95.88480635809748 0.00047529 deg
peri 50.7275610171496 0.00066369 deg
i 1.914628535272272 4.2972e-05 deg
  Orbit Determination Parameters
   # obs. used (total)      68  
   # delay obs. used      0  
   # Doppler obs. used      1  
   data-arc span      6 days  
   first obs. used      2018-12-13  
   last obs. used      2018-12-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      4  
   norm. resid. RMS      .40516  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 20:56:04  

Additional Information
 Jupiter MOID = 3.3429 au 
 T_jup = 5.042 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.522096690200442E-12 2.618160811942292E-13 -2.229310596975461E-10 6.001110263838075E-10 -8.35911793419336E-10 -4.224516296041606E-11
q 2.618160811942292E-13 5.591912543144744E-13 -7.866706635244368E-11 2.796531095983894E-10 -4.108565939504732E-10 -2.703953622487376E-11
tp -2.229310596975461E-10 -7.866706635244368E-11 2.165092190507768E-8 -6.263407365226097E-8 9.104536468399864E-8 5.210795311689314E-9
node 6.001110263838075E-10 2.796531095983894E-10 -6.263407365226097E-8 2.259023855936883E-7 -3.131158813120231E-7 -1.993422499496122E-8
peri -8.35911793419336E-10 -4.108565939504732E-10 9.104536468399864E-8 -3.131158813120231E-7 4.404779757957927E-7 2.757626192580158E-8
i -4.224516296041606E-11 -2.703953622487376E-11 5.210795311689314E-9 -1.993422499496122E-8 2.757626192580158E-8 1.846607060218386E-9

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 26.3   .49875 E2018Y73 autocmod 2.6q

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