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(2018 XR4)
Classification: Apollo [NEO]          SPK-ID: 3836905
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 2 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3572968087863783 0.00056786  
a 1.143903539672775 0.00061177 au
q .73519045538825 0.00027138 au
i 10.21255219091548 0.016045 deg
node 84.44898226539556 0.001237 deg
peri 88.39554385128241 0.0171 deg
M 337.7948493330526 0.53529 deg
tp 2459424.063461473332
(2021-Jul-28.56346147)
0.68657 TDB
period 446.8713713872654
1.22
0.35849
0.0009815
d
yr
n .8056009470519843 0.00064627 deg/d
Q 1.5526166239573 0.00083036 au
  Orbit Determination Parameters
   # obs. used (total)      27  
   data-arc span      1 day  
   first obs. used      2018-12-14  
   last obs. used      2018-12-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      7  
   norm. resid. RMS      .46445  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 20:56:07  

Additional Information
 Earth MOID = .00193137 au 
 Jupiter MOID = 3.43769 au 
 T_jup = 5.411 
[ show covariance matrix ]

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 26.8   .30098 E2018Y12 autocmod 2.6q

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2001-Nov-27 14:17 1_16:33 Earth 0.430366966422867 0.157922210308473 0.703691896099958 24.1920046824847 24.1917487626968 2452241.095367119 2433.37823304804 13642247.4504553 980.25962061883 3.16565048915303 3593.76315034972 T 2 CATAB v2.0g-lin.ifort 2021-Apr-15 20:56:07 2021-Apr-15 20:56
2003-Jun-17 12:11 9_13:10 Moon 0.00971040764289735 0.0055201297371504 0.236713593363114 12.0865949174851 12.0863156744409 2452808.007583546 13749.8940357487 11409336.8818615 10144.0752242074 -36.1159423250733 84.1597189882946 T 2 CATAB v2.0g-lin.ifort 2021-Apr-15 20:56:07 2021-Apr-15 20:56
2018-Dec-17 22:59 00:02 Earth 0.0136732911333263 0.0136119135004206 0.0137346671037042 11.4300341037802 11.4129726504165 2458470.457499473 1.83948917811792 3051.35218177406 36.0917355944556 0.0976925652636253 444.28154071604 T 2 CATAB v2.0g-lin.ifort 2021-Apr-15 20:56:07 2021-Apr-15 20:56
2020-Jul-06 17:46 15:42 Earth 0.415920839879462 0.400566822056263 0.431274845873818 23.3588818346353 23.3586075811375 2459037.240336769 942.029960763835 765634.507990287 17855.7225250933 0.143594657090235 73.7663315293243 T 2 CATAB v2.0g-lin.ifort 2021-Apr-15 20:56:07 2021-Apr-15 20:56
2034-Nov-26 00:45 8_21:44 Earth 0.459001451029722 0.268394845158172 0.64987356600709 25.095093593561 25.0948622744683 2464292.530933381 12824.2791613296 9527320.21054168 341.820253970343 3.02364578874779 7754.2615683367 T 2 CATAB v2.0g-lin.ifort 2021-Apr-15 20:56:07 2021-Apr-15 20:56
2037-Jun-16 05:40 9_06:00 Venus 0.0891212236083393 0.0753964898801217 0.103202927764456 8.24511825173742 8.2421624944604 2465225.736127339 13320.0535814228 749530.977352574 106832.220552096 22.1608801827312 137.119639175551 T 2 CATAB v2.0g-lin.ifort 2021-Apr-15 20:56:07 2021-Apr-15 20:56
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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