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17391 (1981 EK39)
Classification: Main-belt Asteroid          SPK-ID: 2017391
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 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1586817262349177 3.6774e-08  
a 2.329491970870687 7.2555e-09 au
q 1.959844163682546 8.6787e-08 au
i 3.356093279308701 4.6926e-06 deg
node 178.50027085259 5.6456e-05 deg
peri 214.9963497812944 5.7944e-05 deg
M 136.9968198863226 1.3468e-05 deg
tp 2458506.305123141031
(2019-Jan-22.80512314)
4.7866e-05 TDB
period 1298.644419752628
3.56
6.0672e-06
1.661e-08
d
yr
n .2772121410020569 1.2951e-09 deg/d
Q 2.699139778058828 8.4068e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1276  
   data-arc span      14302 days (39.16 yr)  
   first obs. used      1981-03-02  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53259  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 04:35:33  

Additional Information
 Earth MOID = .966967 au 
 Jupiter MOID = 2.72695 au 
 T_jup = 3.553 
[ 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 15.2   n/a MPO452417  
diameter diameter 2.925 km 0.653 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.119   0.059 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

17391 (1981 EK39)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20001013/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1981 EK39 = 1999 GG57 = 2000 NT7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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