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8840 (1989 WT)
Classification: Main-belt Asteroid          SPK-ID: 2008840
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03226935133663168 3.2678e-08  
a 2.267969225654229 7.6284e-09 au
q 2.194783329890924 7.2543e-08 au
i 4.425854997279352 3.6097e-06 deg
node 67.06938556656554 4.7812e-05 deg
peri 70.20853062297473 7.8583e-05 deg
M 249.5239108381562 6.3057e-05 deg
tp 2459383.342332799250
(2021-Jun-17.84233280)
0.00021908 TDB
period 1247.539090615557
3.42
6.2942e-06
1.723e-08
d
yr
n .2885681119798577 1.4559e-09 deg/d
Q 2.341155121417534 7.8746e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1989  
   data-arc span      13268 days (36.33 yr)  
   first obs. used      1984-04-03  
   last obs. used      2020-07-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47728  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 00:02:09  

Additional Information
 Earth MOID = 1.21291 au 
 Jupiter MOID = 2.64463 au 
 T_jup = 3.610 
[ 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 13.8   n/a MPO395085  
diameter diameter 4.763 km 1.074 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
geometric albedo albedo 0.258   0.166 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

8840 (1989 WT)          Discovered 1989-Nov-20 by Ueda, S., Kaneda, H. at Kushiro
Reference: 19980610/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1989 WT = 1984 GX = 1996 VT7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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