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21968 (1999 WE10)
Classification: Main-belt Asteroid          SPK-ID: 2021968
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06799577452557405 3.6068e-08  
a 2.772393932539607 1.4148e-08 au
q 2.583882859806574 1.0046e-07 au
i 8.084124883419724 3.9402e-06 deg
node 82.00529361615111 3.0388e-05 deg
peri 173.1132077868882 4.3651e-05 deg
M 45.87004875811411 3.1877e-05 deg
tp 2458985.663762689930
(2020-May-16.16376269)		 0.00014906 TDB
period 1686.090325289746
4.62		 1.2907e-05
3.534e-08		 d
yr
n .2135116930572125 1.6344e-09 deg/d
Q 2.96090500527264 1.511e-08 au
   Orbit Determination Parameters
   # obs. used (total)      1552  
   data-arc span      10341 days (28.31 yr)  
   first obs. used      1992-04-26  
   last obs. used      2020-08-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46214  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:56:31  

Additional Information
 Earth MOID = 1.56744 au 
 Jupiter MOID = 2.07101 au 
 T_jup = 3.319 
[ show covariance matrix ]

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.75   n/a E2021B10  
diameter diameter 4.693 km 0.025 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.319   0.080 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21968 (1999 WE10)          Discovered 1999-Nov-30 by Kobayashi, T. at Oizumi
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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