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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1293467886602001 6.2941e-08  
a 5.229189856082759 1.1966e-07 au
q 4.55281094090396 3.9663e-07 au
i 26.86767275125217 5.2494e-06 deg
node 108.1750926833366 1.2858e-05 deg
peri 271.7280005869398 2.5357e-05 deg
M 347.2702464609997 2.1359e-05 deg
tp 2459354.942753720230
(2021-May-20.44275372)
0.00025841 TDB
period 4367.672254528885
11.96
0.00014992
4.105e-07
d
yr
n .08242376694513015 2.8291e-09 deg/d
Q 5.905568771261557 1.3514e-07 au
  Orbit Determination Parameters
   # obs. used (total)      988  
   data-arc span      25249 days (69.13 yr)  
   first obs. used      1951-11-28  
   last obs. used      2021-01-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52068  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:28:22  

Additional Information
 Earth MOID = 3.68959 au 
 Jupiter MOID = .0139824 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 11.44   n/a E2021B10  
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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