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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1588194677387781 3.6795e-08  
a 2.329375449379331 7.1756e-09 au
q 1.959425280345128 8.6873e-08 au
i 3.356353095369253 4.6926e-06 deg
node 178.4995747543666 5.6298e-05 deg
peri 214.9119007194135 5.7783e-05 deg
M 246.8935294354994 1.3613e-05 deg
tp 2459804.483517104443
(2022-Aug-12.98351710)
4.9851e-05 TDB
period 1298.546983426932
3.56
6.0002e-06
1.643e-08
d
yr
n .2772329415836318 1.281e-09 deg/d
Q 2.699325618413533 8.3152e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1287  
   data-arc span      14325 days (39.22 yr)  
   first obs. used      1981-03-02  
   last obs. used      2020-05-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53074  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 17:50:39  

Additional Information
 Earth MOID = .965842 au 
 Jupiter MOID = 2.72914 au 
 T_jup = 3.553 
[ 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 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

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