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160857 (2001 EU21)
Classification: Main-belt Asteroid          SPK-ID: 2160857
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 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2546951832605958 6.1982e-08  
a 2.85457243692337 1.9554e-08 au
q 2.127526586970527 1.8224e-07 au
i 5.976787621056983 7.3037e-06 deg
node 274.045813538306 5.8721e-05 deg
peri 281.0553603227266 6.073e-05 deg
M 16.87993743784654 1.7767e-05 deg
tp 2459117.900320761560
(2020-Sep-25.40032076)
8.6478e-05 TDB
period 1761.611062560421
4.82
1.8101e-05
4.956e-08
d
yr
n .2043583896871972 2.0999e-09 deg/d
Q 3.581618286876214 2.4535e-08 au
  Orbit Determination Parameters
   # obs. used (total)      283  
   data-arc span      8940 days (24.48 yr)  
   first obs. used      1995-11-30  
   last obs. used      2020-05-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5737  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 20:03:05  

Additional Information
 Earth MOID = 1.13553 au 
 Jupiter MOID = 1.46944 au 
 T_jup = 3.248 
[ 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 16.03   n/a E2020-QM9  
diameter diameter 4.377 km 0.316 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.037   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

160857 (2001 EU21)          Discovered 2001-Mar-15 by LONEOS at Anderson Mesa
Reference: 20070828/Numbers.arcLast Updated: 2007-08-30

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