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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2548448816811151 6.1949e-08  
a 2.855137515463017 1.9662e-08 au
q 2.127520333151531 1.8225e-07 au
i 5.976807613705613 7.3037e-06 deg
node 274.0479417832909 5.8717e-05 deg
peri 281.042227305254 6.0724e-05 deg
M 336.0222571374349 1.7529e-05 deg
tp 2459117.866666685792
(2020-Sep-25.36666669)
8.6451e-05 TDB
period 1762.134169553156
4.82
1.8203e-05
4.984e-08
d
yr
n .2042977238738236 2.1104e-09 deg/d
Q 3.582754697774502 2.4673e-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.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5737  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 12:23:39  

Additional Information
 Earth MOID = 1.13621 au 
 Jupiter MOID = 1.46947 au 
 T_jup = 3.247 
[ 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 15.9   n/a MPO236955  
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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