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44853 (1999 UR4)
Classification: Main-belt Asteroid          SPK-ID: 2044853
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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08942316547774384 3.3431e-08  
a 2.690986623520063 1.345e-08 au
q 2.450350081386633 8.9184e-08 au
i 5.118633101040492 4.7518e-06 deg
node 167.0287993661221 4.6108e-05 deg
peri 291.1363479108109 5.3935e-05 deg
M 179.0357748941587 2.8566e-05 deg
tp 2458198.631681833993
(2018-Mar-21.13168183)
0.00012746 TDB
period 1612.373810264558
4.41
1.2088e-05
3.31e-08
d
yr
n .2232732866958012 1.6739e-09 deg/d
Q 2.931623165653492 1.4652e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1014  
   data-arc span      8117 days (22.22 yr)  
   first obs. used      1997-04-11  
   last obs. used      2019-07-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51441  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 07:52:52  

Additional Information
 Earth MOID = 1.47286 au 
 Jupiter MOID = 2.19367 au 
 T_jup = 3.360 
[ 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 14.9   n/a MPO337618  
diameter diameter 2.900 km 0.433 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.277   0.086 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

44853 (1999 UR4)          Discovered 1999-Oct-31 by Sarounova, L. at Ondrejov
Reference: 20020822/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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