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136569 (1981 EN2)
Classification: Main-belt Asteroid          SPK-ID: 2136569
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1371622675712228 4.4529e-08  
a 3.09964767298529 2.6042e-08 au
q 2.674492969486764 1.3626e-07 au
i 8.994476310813862 5.6302e-06 deg
node 258.0043621960583 4.3696e-05 deg
peri 205.1552416148162 5.2187e-05 deg
M 130.3324855642306 2.7309e-05 deg
tp 2458278.865809601392
(2018-Jun-09.36580960)
0.00014942 TDB
period 1993.273644854026
5.46
2.512e-05
6.877e-08
d
yr
n .180607414806994 2.276e-09 deg/d
Q 3.524802376483816 2.9613e-08 au
  Orbit Determination Parameters
   # obs. used (total)      433  
   data-arc span      14405 days (39.44 yr)  
   first obs. used      1979-11-22  
   last obs. used      2019-05-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57251  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 04:12:00  

Additional Information
 Earth MOID = 1.6945 au 
 Jupiter MOID = 1.68331 au 
 T_jup = 3.189 
[ 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 15.1   n/a MPO296974  
diameter diameter 6.126 km 0.418 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.057   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

136569 (1981 EN2)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20061205/Numbers.arcLast Updated: 2006-12-13

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