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215653 (2003 UM121)
Classification: Main-belt Asteroid          SPK-ID: 2215653
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1654406069951865 4.3828e-08  
a 2.308478827316826 1.6483e-08 au
q 1.926562688889994 1.0177e-07 au
i 5.623198401529611 7.6193e-06 deg
node 15.81437256831685 5.0087e-05 deg
peri 276.7396617180599 5.6301e-05 deg
M 342.0085173267798 2.6365e-05 deg
tp 2459064.525315102885
(2020-Aug-03.02531510)
9.3707e-05 TDB
period 1281.112505049218
3.51
1.3721e-05
3.757e-08
d
yr
n .2810057653649782 3.0096e-09 deg/d
Q 2.690394965743658 1.921e-08 au
  Orbit Determination Parameters
   # obs. used (total)      248  
   data-arc span      9187 days (25.15 yr)  
   first obs. used      1995-04-06  
   last obs. used      2020-05-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50764  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-24 04:14:51  

Additional Information
 Earth MOID = .920569 au 
 Jupiter MOID = 2.50969 au 
 T_jup = 3.561 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 17.1   n/a MPO433411  
diameter diameter 1.569 km 0.372 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.125   0.079 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

215653 (2003 UM121)          Discovered 2003-Oct-19 by Spacewatch at Kitt Peak
Reference: 20090607/Numbers.arcLast Updated: 2009-06-08
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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