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38598 (1999 XQ208)
Classification: Jupiter Trojan          SPK-ID: 2038598
[ 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.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04963942773171375 4.5717e-08  
a 5.150411015829468 1.2245e-07 au
q 4.894747560420579 3.1663e-07 au
i 11.60672377981457 6.8229e-06 deg
node 44.26175773950532 2.8232e-05 deg
peri 64.59563479897977 9.09e-05 deg
M 258.9463271366128 8.8976e-05 deg
tp 2460198.925003189597
(2023-Sep-11.42500319)		 0.0010759 TDB
period 4269.345080920531
11.69		 0.00015225
4.168e-07		 d
yr
n .08432206654102996 3.007e-09 deg/d
Q 5.406074471238358 1.2852e-07 au
   Orbit Determination Parameters
   # obs. used (total)      529  
   data-arc span      10808 days (29.59 yr)  
   first obs. used      1991-04-15  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55716  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 21:09:45  

Additional Information
 Earth MOID = 3.93113 au 
 Jupiter MOID = .0711 au 
 T_jup = 2.957 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457485.5 (2016-Apr-07.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05029911420686118 4.5625e-08  
q 4.88512756340394 3.1409e-07 au
tp 2455951.999105001456
(2012-Jan-25.49910500)		 0.00099568 TDB
node 44.27567667895997 2.8228e-05 deg
peri 65.95952760492429 8.9982e-05 deg
i 11.61190147795739 6.8252e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      529  
   data-arc span      10808 days (29.59 yr)  
   first obs. used      1991-04-15  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55716  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 21:09:45  

Additional Information
 Jupiter MOID = .0711 au 
 T_jup = 2.957 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.081598584579091E-15 -1.363880978691968E-14 -3.350541022193839E-13 -1.545428726835674E-15 -1.323736941935426E-13 -1.189117667601474E-15
q -1.363880978691968E-14 9.865343950819554E-14 4.53527272999718E-11 2.173229812138746E-14 4.85771483534799E-12 1.269264154042557E-14
tp -3.350541022193839E-13 4.53527272999718E-11 9.913772087573849E-7 1.146192723531826E-10 8.508719709881186E-8 2.935222216113596E-11
node -1.545428726835674E-15 2.173229812138746E-14 1.146192723531826E-10 7.968455318593244E-10 -7.700867308175094E-10 -1.055700308848416E-10
peri -1.323736941935426E-13 4.85771483534799E-12 8.508719709881186E-8 -7.700867308175094E-10 8.096727911645263E-9 1.061176138819047E-10
i -1.189117667601474E-15 1.269264154042557E-14 2.935222216113596E-11 -1.055700308848416E-10 1.061176138819047E-10 4.65834741340604E-11

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.4   n/a MPO439356  
diameter diameter 13.211 km 1.077 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2011ApJ...742...40G)  
geometric albedo albedo 0.122   0.029 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2011ApJ...742...40G)  

38598 (1999 XQ208)          Discovered 1999-Dec-13 by LINEAR at Socorro
Reference: 20020328/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 XQ208 = 1997 UL26 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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