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JPL Small-Body Database Browser
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91844 (1999 UR2)
Classification: Main-belt Asteroid          SPK-ID: 2091844
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 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04421472827901553 5.2028e-08  
a 3.090312648548315 3.2637e-08 au
q 2.953675314495547 1.7089e-07 au
i 7.433966961045028 6.741e-06 deg
node 249.5907992588307 4.3848e-05 deg
peri 35.67310949862689 9.8842e-05 deg
M 34.06947884378804 8.4577e-05 deg
tp 2458812.713206839497
(2019-Nov-25.21320684)
0.00046717 TDB
period 1984.275892441695
5.43
3.1434e-05
8.606e-08
d
yr
n .1814263839878698 2.8741e-09 deg/d
Q 3.226949982601084 3.408e-08 au
  Orbit Determination Parameters
   # obs. used (total)      562  
   data-arc span      7252 days (19.85 yr)  
   first obs. used      1999-10-12  
   last obs. used      2019-08-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57009  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 02:58:32  

Additional Information
 Earth MOID = 1.94106 au 
 Jupiter MOID = 1.85018 au 
 T_jup = 3.211 
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Orbital Elements at Epoch 2456974.5 (2014-Nov-13.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04463079835019127 5.1337e-08  
q 2.952874631348429 1.6975e-07 au
tp 2456852.974808410969
(2014-Jul-14.47480841)
0.00048106 TDB
node 249.6540886447986 4.3815e-05 deg
peri 40.23591753185845 9.9034e-05 deg
i 7.435689532261359 6.7471e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      562  
   data-arc span      7252 days (19.85 yr)  
   first obs. used      1999-10-12  
   last obs. used      2019-08-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57009  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 02:58:32  

Additional Information
 Jupiter MOID = 1.85018 au 
 T_jup = 3.211 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.635453206494787E-15 -8.577289779266027E-15 -1.431907316861797E-12 8.127155770968526E-15 -2.568881038565875E-13 8.733365985967623E-17
q -8.577289779266027E-15 2.881578081471166E-14 -1.78482403356949E-12 -2.132973898937119E-14 -3.398907134163209E-13 1.925702835551981E-15
tp -1.431907316861797E-12 -1.78482403356949E-12 2.314141747949161E-7 -2.679085135954174E-10 4.276430335318604E-8 -1.012411080750795E-11
node 8.127155770968526E-15 -2.132973898937119E-14 -2.679085135954174E-10 1.91974803830906E-9 -1.952239365640068E-9 -5.049895648938729E-11
peri -2.568881038565875E-13 -3.398907134163209E-13 4.276430335318604E-8 -1.952239365640068E-9 9.807794703165438E-9 4.83227862305513E-11
i 8.733365985967623E-17 1.925702835551981E-15 -1.012411080750795E-11 -5.049895648938729E-11 4.83227862305513E-11 4.552298325223536E-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 14.3   n/a MPO436414  

91844 (1999 UR2)          Discovered 1999-Oct-19 by Kusnirak, P., Pravec, P. at Ondrejov
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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