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102880 (1999 WA18)
Classification: Main-belt Asteroid          SPK-ID: 2102880
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2169843284021465 3.2054e-08  
a 2.374871249097505 9.0823e-09 au
q 1.859561406070516 7.9209e-08 au
i 1.719135839034444 4.2499e-06 deg
node 69.14740935747723 0.00016741 deg
peri 228.8996530590613 0.00016797 deg
M 1.568630787796189 1.362e-05 deg
tp 2459194.675257034265
(2020-Dec-11.17525703)
5.0574e-05 TDB
period 1336.775667020115
3.66
7.6684e-06
2.099e-08
d
yr
n .2693047224613963 1.5449e-09 deg/d
Q 2.890181092124494 1.1053e-08 au
  Orbit Determination Parameters
   # obs. used (total)      590  
   data-arc span      9680 days (26.50 yr)  
   first obs. used      1994-03-06  
   last obs. used      2020-09-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55286  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 15:44:03  

Additional Information
 Earth MOID = .842347 au 
 Jupiter MOID = 2.32802 au 
 T_jup = 3.509 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.41   n/a E2021B55  

102880 (1999 WA18)          Discovered 1999-Nov-30 by Spacewatch at Kitt Peak
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

Alternate Designations
 1999 WA18 = 1998 HW39 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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