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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 242 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3368296006322614 5.3851e-08  
a .7812312437297383 2.7433e-09 au
q .5180894359028058 4.2609e-08 au
i 3.804198839842135 5.6277e-06 deg
node 188.3989921020678 0.0001051 deg
peri 59.70389356830143 0.00010326 deg
M 68.34697007113009 3.854e-05 deg
tp 2459152.616642148393
(2020-Oct-30.11664215)
2.6819e-05 TDB
period 252.2132116264779
0.69
1.3285e-06
3.637e-09
d
yr
n 1.427363767656835 7.5184e-09 deg/d
Q 1.044373051556671 3.6674e-09 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -5.455772078123915E-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.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42073  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-14 09:43:36  

Additional Information
 Earth MOID = .0350604 au 
 Jupiter MOID = 3.97483 au 
 T_jup = 7.389 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455880.5 (2011-Nov-15.0) TDB
Reference: JPL 242 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3368697183683681 5.4249e-08  
q .5181159414519368 4.3105e-08 au
tp 2455874.005496499709
(2011-Nov-08.50549650)
1.8644e-05 TDB
node 188.8439011447707 0.00010433 deg
peri 59.28064089827274 0.00010258 deg
i 3.795488806202251 5.6773e-06 deg

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -5.455772078123915E-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.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42073  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-14 09:43:36  

Additional Information
 Jupiter MOID = 3.97483 au 
 T_jup = 7.389 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
Orbit Covariance (7×7)
  e q tp node peri i A2
e 2.943002077068507E-15 -2.337684154276797E-15 4.84861983972364E-13 2.384530322144974E-12 -1.901784308634639E-12 1.857802203702438E-13 -2.6416305643126E-23
q -2.337684154276797E-15 1.858026205124083E-15 -3.808929354180465E-13 -1.894820625409575E-12 1.508119859562549E-12 -1.479193496029285E-13 2.256548264927689E-23
tp 4.84861983972364E-13 -3.808929354180465E-13 3.475844782451496E-10 2.176374984808728E-10 5.366952294933093E-11 2.826172864280325E-11 5.036097242674898E-21
node 2.384530322144974E-12 -1.894820625409575E-12 2.176374984808728E-10 1.088396889841079E-8 -1.057645775133274E-8 4.930291270206933E-10 -1.502260445569247E-20
peri -1.901784308634639E-12 1.508119859562549E-12 5.366952294933093E-11 -1.057645775133274E-8 1.052307454034158E-8 -4.611808864786404E-10 9.793832238395832E-21
i 1.857802203702438E-13 -1.479193496029285E-13 2.826172864280325E-11 4.930291270206933E-10 -4.611808864786404E-10 3.223206833517875E-11 -1.46887164335667E-21
A2 -2.6416305643126E-23 2.256548264927689E-23 5.036097242674898E-21 -1.502260445569247E-20 9.793832238395832E-21 -1.46887164335667E-21 3.038749346267804E-30

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. 2020-October); 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

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