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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .254844881703275 6.1949e-08  
a 2.855137516144343 1.971e-08 au
q 2.127520333595956 1.8226e-07 au
i 5.976807759491463 7.3231e-06 deg
node 274.0479413474694 5.8737e-05 deg
peri 281.0422282717397 6.0753e-05 deg
M 336.0222563841767 1.7597e-05 deg
tp 2459117.866670414865
(2020-Sep-25.36667041)
8.679e-05 TDB
period 1762.134170183908
4.82
1.8247e-05
4.996e-08
d
yr
n .2042977238006957 2.1155e-09 deg/d
Q 3.582754698692731 2.4733e-08 au
  Orbit Determination Parameters
   # obs. used (total)      279  
   data-arc span      8907 days (24.39 yr)  
   first obs. used      1995-11-30  
   last obs. used      2020-04-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57294  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-21 01:36:56  

Additional Information
 Earth MOID = 1.13621 au 
 Jupiter MOID = 1.46947 au 
 T_jup = 3.247 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457448.5 (2016-Mar-01.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2557098692204465 6.1934e-08  
q 2.12430219681127 1.823e-07 au
tp 2457354.896397593718
(2015-Nov-28.39639759)
7.7962e-05 TDB
node 274.0825736463196 5.8754e-05 deg
peri 280.8631295082027 6.0754e-05 deg
i 5.977080672925759 7.3237e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      279  
   data-arc span      8907 days (24.39 yr)  
   first obs. used      1995-11-30  
   last obs. used      2020-04-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57294  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-21 01:36:56  

Additional Information
 Jupiter MOID = 1.46947 au 
 T_jup = 3.247 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.835839977841042E-15 -1.125810155252257E-14 -1.878698992020331E-12 8.804803881492993E-15 -2.229978810896446E-13 -4.247265456472012E-16
q -1.125810155252257E-14 3.323272567678499E-14 5.800740349017309E-12 -2.732696032467803E-14 7.180545734307037E-13 1.779845442238169E-15
tp -1.878698992020331E-12 5.800740349017309E-12 6.078139970158524E-9 -3.144943029139102E-11 1.228542179316211E-9 3.175324495582024E-12
node 8.804803881492993E-15 -2.732696032467803E-14 -3.144943029139102E-11 3.452051778780035E-9 -3.438806348209792E-9 8.681699852445883E-11
peri -2.229978810896446E-13 7.180545734307037E-13 1.228542179316211E-9 -3.438806348209792E-9 3.690992881622273E-9 -8.568879127753291E-11
i -4.247265456472012E-16 1.779845442238169E-15 3.175324495582024E-12 8.681699852445883E-11 -8.568879127753291E-11 5.363729148796826E-11

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

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