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JPL Small-Body Database Browser
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13785 (1998 UR20)
Classification: Main-belt Asteroid          SPK-ID: 2013785
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .00912807116950639 5.1185e-08  
a 2.853426921468823 1.4269e-08 au
q 2.82738063745267 1.439e-07 au
i .9899160348953348 4.0388e-06 deg
node 292.2156221703697 0.00029931 deg
peri 50.72698709225531 0.0003795 deg
M 233.3491177857569 0.00023474 deg
tp 2459619.875863091761
(2022-Feb-09.37586309)
0.0011486 TDB
period 1760.550789814855
4.82
1.3206e-05
3.616e-08
d
yr
n .2044814623256957 1.5338e-09 deg/d
Q 2.879473205484976 1.44e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1393  
   data-arc span      15122 days (41.40 yr)  
   first obs. used      1978-09-06  
   last obs. used      2020-01-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53573  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 20:45:19  

Additional Information
 Earth MOID = 1.81669 au 
 Jupiter MOID = 2.12876 au 
 T_jup = 3.304 
[ 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 14.1   n/a MPO467833  
diameter diameter 4.761 km 0.422 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.178   0.046 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

13785 (1998 UR20)          Discovered 1998-Oct-29 by Korlevic, K. at Visnjan
Reference: 20000222/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1998 UR20 = 1978 RW12 = 1991 GC4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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