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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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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 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
(2020-Feb-20.90558316)
2.5904e-05 TDB
period 252.2056573516161
0.69
1.2937e-06
3.542e-09
d
yr
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] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
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) http://www.asu.cas.cz/~ppravec/neo.htm]
geometric albedo albedo 0.029   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

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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