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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04963943090969591 4.6417e-08  
a 5.150411022891884 1.2363e-07 au
q 4.894747550764506 3.1763e-07 au
i 11.60672386553117 6.8276e-06 deg
node 44.26176014151949 2.9041e-05 deg
peri 64.59563580753371 9.1469e-05 deg
M 258.9463230924851 8.9504e-05 deg
tp 2460198.925053615068
(2023-Sep-11.42505362)
0.0010827 TDB
period 4269.345089701935
11.69
0.00015373
4.209e-07
d
yr
n .0843220663675921 3.0362e-09 deg/d
Q 5.406074495019262 1.2977e-07 au
  Orbit Determination Parameters
   # obs. used (total)      515  
   data-arc span      10780 days (29.51 yr)  
   first obs. used      1991-04-15  
   last obs. used      2020-10-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56203  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 00:25:05  

Additional Information
 Earth MOID = 3.93113 au 
 Jupiter MOID = .0711 au 
 T_jup = 2.957 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457359.5 (2015-Dec-03.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05047011411783278 4.6354e-08  
q 4.883453123515371 3.1522e-07 au
tp 2455951.325540202800
(2012-Jan-24.82554020)
0.0009965 TDB
node 44.27736309790039 2.9035e-05 deg
peri 65.86063045503367 9.0248e-05 deg
i 11.61320811770656 6.8307e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      515  
   data-arc span      10780 days (29.51 yr)  
   first obs. used      1991-04-15  
   last obs. used      2020-10-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56203  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 00:25:05  

Additional Information
 Jupiter MOID = .0711 au 
 T_jup = 2.957 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.14869591326266E-15 -1.385574875567788E-14 3.484817599700838E-13 -1.803308319666658E-15 -7.782333787657174E-14 -1.154722284438497E-15
q -1.385574875567788E-14 9.936629479836589E-14 4.311592299317754E-11 2.543700852629111E-14 4.677128990081338E-12 1.314854361510353E-14
tp 3.484817599700838E-13 4.311592299317754E-11 9.930115352528138E-7 1.391322211942493E-10 8.517786969555538E-8 3.194858282017707E-11
node -1.803308319666658E-15 2.543700852629111E-14 1.391322211942493E-10 8.430099031963563E-10 -8.131237830057562E-10 -1.038440442921752E-10
peri -7.782333787657174E-14 4.677128990081338E-12 8.517786969555538E-8 -8.131237830057562E-10 8.14467849885984E-9 1.046600399536012E-10
i -1.154722284438497E-15 1.314854361510353E-14 3.194858282017707E-11 -1.038440442921752E-10 1.046600399536012E-10 4.665798428314338E-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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