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363505 (2003 UC20)
Classification: Aten [NEO, PHA]          SPK-ID: 2363505
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet 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. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet is not working, here are some notes that might help.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 241 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .336852359845514 5.3856e-08  
a .7812156440578867 2.6715e-09 au
q .5180613108087545 4.2596e-08 au
i 3.804202882986439 5.6279e-06 deg
node 188.4019685478532 0.0001051 deg
peri 59.70046651072131 0.00010326 deg
M 142.8754233415836 3.7487e-05 deg
tp 2458900.405583157626
2.5904e-05 TDB
period 252.2056573516161
n 1.427406521250635 7.322e-09 deg/d
Q 1.044369977307019 3.5715e-09 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -4.766065953875153E-15 1.743E-15
ALN [SET] 1. n/a
NK [SET] 0. n/a
NM [SET] 2. n/a
R0 [SET] 1. n/a
  Orbit Determination Parameters
   # obs. used (total)      471  
   # delay obs. used      1  
   # Doppler obs. used      4  
   data-arc span      23724 days (64.95 yr)  
   first obs. used      1954-12-05  
   last obs. used      2019-11-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42942  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-19 04:52:13  

Additional Information
 Earth MOID = .0348294 au 
 Jupiter MOID = 3.97595 au 
 T_jup = 7.389 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
[ 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 18.4   n/a MPO503423  
diameter diameter 1.876 km 0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (  
rotation period rot_per 29.6 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2019)]
geometric albedo albedo 0.029   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (  

363505 (2003 UC20)          Discovered 2003-Oct-21 by LINEAR at Socorro
Reference: Last Updated: 2013-06-26

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Alternate Designations
 2003 UC20 = 1954 XA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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