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20716 (1999 XG91)
Classification: Jupiter Trojan          SPK-ID: 2020716
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1293788899136724 6.4344e-08  
a 5.2301587698678 1.3318e-07 au
q 4.553486634150046 4.1411e-07 au
i 26.86764868898911 6.0376e-06 deg
node 108.1750767060188 1.3285e-05 deg
peri 271.5674461042482 2.9913e-05 deg
M 330.9149337869491 3.0383e-05 deg
tp 2459353.470404050490
(2021-May-18.97040405)
0.00037166 TDB
period 4368.886236234818
11.96
0.00016688
4.569e-07
d
yr
n .08240086386645175 3.1475e-09 deg/d
Q 5.906830905585555 1.5042e-07 au
  Orbit Determination Parameters
   # obs. used (total)      737  
   data-arc span      24805 days (67.91 yr)  
   first obs. used      1951-11-28  
   last obs. used      2019-10-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56084  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 04:24:40  

Additional Information
 Earth MOID = 3.69134 au 
 Jupiter MOID = .0147764 au 
 T_jup = 2.769 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.4   n/a MPO384932  
diameter diameter 26.367 km 0.397 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
geometric albedo albedo 0.077   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

20716 (1999 XG91)          Discovered 1999-Dec-07 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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