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18477 (1995 WA11)
Classification: Main-belt Asteroid          SPK-ID: 2018477
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .216857359095131 4.1352e-08  
a 3.1645611718296 2.3419e-08 au
q 2.47830279341164 1.3748e-07 au
i 10.455618824714 5.1721e-06 deg
node 54.75925132185034 2.7127e-05 deg
peri 258.9777191428808 2.9603e-05 deg
M 200.3952975949641 1.2761e-05 deg
tp 2459912.115816424597
(2022-Nov-28.61581642)
7.5238e-05 TDB
period 2056.215693946246
5.63
2.2825e-05
6.249e-08
d
yr
n .1750789088225932 1.9435e-09 deg/d
Q 3.85081955024756 2.8498e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1012  
   data-arc span      8844 days (24.21 yr)  
   first obs. used      1995-11-14  
   last obs. used      2020-01-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56594  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 22:26:44  

Additional Information
 Earth MOID = 1.49117 au 
 Jupiter MOID = 1.59824 au 
 T_jup = 3.142 
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Orbital Elements at Epoch 2456778.5 (2014-May-01.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2126514544082927 4.0855e-08  
q 2.499974241181457 1.3538e-07 au
tp 2455788.296514649653
(2011-Aug-14.79651465)
7.8507e-05 TDB
node 55.10525015108016 2.7101e-05 deg
peri 257.9138083377001 2.9816e-05 deg
i 10.45006092229736 5.1613e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1012  
   data-arc span      8844 days (24.21 yr)  
   first obs. used      1995-11-14  
   last obs. used      2020-01-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56594  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 22:26:44  

Additional Information
 Jupiter MOID = 1.59824 au 
 T_jup = 3.142 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.66914415976813E-15 -5.48219656606937E-15 1.106140248084964E-12 -6.01854423656353E-15 1.559124418247856E-13 1.297026797306271E-15
q -5.48219656606937E-15 1.832898545426047E-14 -3.985318956954784E-12 1.079432441495442E-14 -5.402628234300623E-13 -2.127793607876469E-15
tp 1.106140248084964E-12 -3.985318956954784E-12 6.16342548953206E-9 2.052346978418679E-11 9.947504485051666E-10 -7.064751296853464E-12
node -6.01854423656353E-15 1.079432441495442E-14 2.052346978418679E-11 7.344894165866279E-10 -7.213561810062054E-10 -4.047184670078916E-11
peri 1.559124418247856E-13 -5.402628234300623E-13 9.947504485051666E-10 -7.213561810062054E-10 8.88986128663769E-10 3.933737331939297E-11
i 1.297026797306271E-15 -2.127793607876469E-15 -7.064751296853464E-12 -4.047184670078916E-11 3.933737331939297E-11 2.663860732113266E-11

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 14.2   n/a MPO381412  
diameter diameter 10.900 km 0.090 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.045   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18477 (1995 WA11)          Discovered 1995-Nov-16 by Spacewatch at Kitt Peak
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1995 WA11 = 1999 JK45 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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