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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05006633682300103 4.5191e-08  
a 5.15302382865571 1.2096e-07 au
q 4.895030801993283 3.1687e-07 au
i 11.60436705779798 6.8193e-06 deg
node 44.26758451170436 2.7097e-05 deg
peri 64.06357823410163 8.9264e-05 deg
M 292.8991046268613 8.7815e-05 deg
tp 2460192.874723858662
(2023-Sep-05.37472386)
0.0010556 TDB
period 4272.594262637602
11.70
0.00015045
4.119e-07
d
yr
n .08425794210044206 2.9669e-09 deg/d
Q 5.411016855318136 1.2702e-07 au
  Orbit Determination Parameters
   # obs. used (total)      557  
   data-arc span      10895 days (29.83 yr)  
   first obs. used      1991-04-15  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54845  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 08:36:24  

Additional Information
 Earth MOID = 3.93143 au 
 Jupiter MOID = .0727279 au 
 T_jup = 2.957 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457675.5 (2016-Oct-14.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05008700697044045 4.4986e-08  
q 4.88707453481777 3.133e-07 au
tp 2455951.898237340101
(2012-Jan-25.39823734)
0.00099245 TDB
node 44.27137944190564 2.7093e-05 deg
peri 66.0043547771233 8.9512e-05 deg
i 11.61020483265582 6.8228e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      557  
   data-arc span      10895 days (29.83 yr)  
   first obs. used      1991-04-15  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54845  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 08:36:24  

Additional Information
 Jupiter MOID = .0727279 au 
 T_jup = 2.957 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.023743073928236E-15 -1.347022591200023E-14 -1.19709203473714E-12 -4.81704557798064E-16 -2.038828870317808E-13 -1.25429628855368E-15
q -1.347022591200023E-14 9.815700768547563E-14 4.789936300347128E-11 6.532681490475635E-15 5.080117943093721E-12 1.252478772643472E-14
tp -1.19709203473714E-12 4.789936300347128E-11 9.849592533880573E-7 5.402330200398671E-12 8.467024161915008E-8 2.775337278086966E-11
node -4.81704557798064E-16 6.532681490475635E-15 5.402330200398671E-12 7.340373045735869E-10 -7.181732384809263E-10 -1.052826294459256E-10
peri -2.038828870317808E-13 5.080117943093721E-12 8.467024161915008E-8 -7.181732384809263E-10 8.012419614620552E-9 1.056963070247855E-10
i -1.25429628855368E-15 1.252478772643472E-14 2.775337278086966E-11 -1.052826294459256E-10 1.056963070247855E-10 4.654992772272304E-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 12.47   n/a MPCxxxxx  
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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