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(2018 XS4)
Classification: Apollo [NEO]          SPK-ID: 3836906
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 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5946208647393626 7.3513e-07  
a 2.450890714200338 4.4056e-06 au
q .9935399583408588 2.2925e-08 au
i 6.388353520233037 1.2995e-05 deg
node 266.1040232296109 5.8811e-06 deg
peri 173.7409552666061 2.6374e-05 deg
M 239.4805264240023 0.00065108 deg
tp 2459865.679547116114
(2022-Oct-13.17954712)
0.0037997 TDB
period 1401.4717451889
3.84
0.0037788
1.035e-05
d
yr
n .2568728204730782 6.9261e-07 deg/d
Q 3.908241470059817 7.0252e-06 au
  Orbit Determination Parameters
   # obs. used (total)      80  
   # delay obs. used      1  
   # Doppler obs. used      1  
   data-arc span      31 days  
   first obs. used      2018-12-13  
   last obs. used      2019-01-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      3  
   norm. resid. RMS      .29094  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 20:56:07  

Additional Information
 Earth MOID = .0113719 au 
 Jupiter MOID = 1.3846 au 
 T_jup = 3.220 
[ hide covariance matrix ]
Orbital Elements at Epoch 2458468.5 (2018-Dec-16.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5999889319090436 7.2037e-07  
q .9888170617967835 1.7374e-08 au
tp 2458465.329720424491
(2018-Dec-12.82972042)
2.1488e-05 TDB
node 266.1213613460966 5.8493e-06 deg
peri 173.5527651056076 2.6449e-05 deg
i 6.376029193384662 1.297e-05 deg
  Orbit Determination Parameters
   # obs. used (total)      80  
   # delay obs. used      1  
   # Doppler obs. used      1  
   data-arc span      31 days  
   first obs. used      2018-12-13  
   last obs. used      2019-01-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      3  
   norm. resid. RMS      .29094  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 20:56:07  

Additional Information
 Jupiter MOID = 1.3846 au 
 T_jup = 3.220 
Orbit Covariance (6×6)
  e q tp node peri i
e 5.189374328214725E-13 8.047935268188932E-15 1.107470840132273E-11 6.306627370393611E-13 1.239867665607362E-11 6.574737897318956E-12
q 8.047935268188932E-15 3.018591648937478E-16 3.267882814493646E-13 2.891462719504171E-14 3.68937888703349E-13 1.48584150340269E-13
tp 1.107470840132273E-11 3.267882814493646E-13 4.617513195298078E-10 1.290355978208761E-11 5.528111332304402E-10 1.732061014625886E-10
node 6.306627370393611E-13 2.891462719504171E-14 1.290355978208761E-11 3.421453508802443E-11 -1.969438905180727E-11 -1.852758375906841E-11
peri 1.239867665607362E-11 3.68937888703349E-13 5.528111332304402E-10 -1.969438905180727E-11 6.995350816394536E-10 2.244890578846528E-10
i 6.574737897318956E-12 1.48584150340269E-13 1.732061014625886E-10 -1.852758375906841E-11 2.244890578846528E-10 1.682116540262169E-10

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 25.2   .49269 MPO467280 autocmod 2.6q

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