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JPL Small-Body Database Browser
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3136 Anshan (1981 WD4)
Classification: Main-belt Asteroid          SPK-ID: 2003136
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1413409838149818 3.427e-08  
a 3.153241367983081 1.7538e-08 au
q 2.707559130826253 1.1059e-07 au
i 4.542449873406313 3.6283e-06 deg
node 80.77857355145206 5.36e-05 deg
peri 36.38527077669686 5.5416e-05 deg
M 257.2272449524021 1.5517e-05 deg
tp 2459584.361378452982
(2022-Jan-04.86137845)
9.0516e-05 TDB
period 2045.192776487571
5.60
1.7063e-05
4.672e-08
d
yr
n .1760225266482051 1.4685e-09 deg/d
Q 3.598923605139908 2.0017e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2133  
   data-arc span      29897 days (81.85 yr)  
   first obs. used      1938-02-19  
   last obs. used      2019-12-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48771  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 18:55:22  

Additional Information
 Earth MOID = 1.72555 au 
 Jupiter MOID = 1.50838 au 
 T_jup = 3.187 
[ 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 12.0   n/a MPO452207  
diameter diameter 19.032 km 0.119 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
geometric albedo albedo 0.055   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

3136 Anshan (1981 WD4)          Discovered 1981-Nov-18 by Purple Mountain Observatory at Nanking
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1981 WD4 = 1938 DL = 1978 BC 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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