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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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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1588110294822418 3.676e-08  
a 2.329194291959404 7.2279e-09 au
q 1.959292548589169 8.6734e-08 au
i 3.356356861081079 4.6928e-06 deg
node 178.501424743642 5.6342e-05 deg
peri 214.9617590728001 5.7828e-05 deg
M 192.4855249996056 1.3541e-05 deg
tp 2459804.666780536517
(2022-Aug-13.16678054)
4.9904e-05 TDB
period 1298.395502792426
3.55
6.0437e-06
1.655e-08
d
yr
n .2772652856743244 1.2906e-09 deg/d
Q 2.699096035329638 8.3757e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1283  
   data-arc span      14325 days (39.22 yr)  
   first obs. used      1981-03-02  
   last obs. used      2020-05-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53143  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:21:18  

Additional Information
 Earth MOID = .965255 au 
 Jupiter MOID = 2.72814 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 15.16   n/a E2021B10  
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

[ show close-approach data ]
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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