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27684 (1981 EX20)
Classification: Main-belt Asteroid          SPK-ID: 2027684
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09265596131953489 4.4191e-08  
a 2.79928878167107 1.5421e-08 au
q 2.539917988594348 1.2565e-07 au
i 7.722589092066723 5.3345e-06 deg
node 165.2775839002797 3.7121e-05 deg
peri 92.48136799344385 4.7404e-05 deg
M 337.2445788844709 2.8659e-05 deg
tp 2458708.631532644477
(2019-Aug-13.13153264)
0.00013617 TDB
period 1710.684744280404
4.68
1.4136e-05
3.87e-08
d
yr
n .2104420473752651 1.7389e-09 deg/d
Q 3.058659574747792 1.685e-08 au
  Orbit Determination Parameters
   # obs. used (total)      947  
   data-arc span      13977 days (38.27 yr)  
   first obs. used      1981-02-02  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54755  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 03:28:39  

Additional Information
 Earth MOID = 1.53961 au 
 Jupiter MOID = 2.01469 au 
 T_jup = 3.306 
[ 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 14.6   n/a MPO347729  
diameter diameter 3.533 km 0.239 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.205   0.048 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

27684 (1981 EX20)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20010902/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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