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4213 Njord (1987 ST4)
Classification: Main-belt Asteroid          SPK-ID: 2004213
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07588752291336129 3.114e-08  
a 2.38845214243532 8.1402e-09 au
q 2.207198425748792 7.2543e-08 au
i 3.41246885167689 4.106e-06 deg
node 253.2225948060769 6.8901e-05 deg
peri 219.3584893663913 7.765e-05 deg
M 84.08333384872554 3.4553e-05 deg
tp 2458285.594196447239
(2018-Jun-16.09419645)
0.0001293 TDB
period 1348.258734399744
3.69
6.8926e-06
1.887e-08
d
yr
n .2670110645789919 1.365e-09 deg/d
Q 2.569705859121847 8.758e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1927  
   data-arc span      18104 days (49.57 yr)  
   first obs. used      1969-10-16  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47674  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 00:17:43  

Additional Information
 Earth MOID = 1.22529 au 
 Jupiter MOID = 2.50275 au 
 T_jup = 3.527 
[ 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 13.7   n/a MPO473824  
diameter diameter 5.906 km 1.110 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  
geometric albedo albedo 0.202   0.067 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  

4213 Njord (1987 ST4)          Discovered 1987-Sep-25 by Jensen, P. at Brorfelde
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1987 ST4 = 1969 UA = 1969 VL = 1973 YH3 = 1980 TY11 = 1982 FK2 = 1984 YQ1 = 1989 CS7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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