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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 ]

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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 .07582950014656831 3.0428e-08  
a 2.38970763316781 8.1823e-09 au
q 2.208497297848256 7.0587e-08 au
i 3.410568682914239 4.0558e-06 deg
node 253.2063443840987 6.7278e-05 deg
peri 220.141914458768 7.5963e-05 deg
M 189.9866114215673 3.418e-05 deg
tp 2459637.729988427639
(2022-Feb-27.22998843)
0.00012829 TDB
period 1349.321943125196
3.69
6.9301e-06
1.897e-08
d
yr
n .266800671132788 1.3703e-09 deg/d
Q 2.570917968487364 8.8028e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2047  
   data-arc span      18456 days (50.53 yr)  
   first obs. used      1969-10-16  
   last obs. used      2020-04-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48183  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 02:04:45  

Additional Information
 Earth MOID = 1.22634 au 
 Jupiter MOID = 2.49821 au 
 T_jup = 3.526 
[ 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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