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JPL Small-Body Database Browser
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20720 (1999 XP101)
Classification: Jupiter Trojan          SPK-ID: 2020720
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1444577445315471 7.3707e-08  
a 5.293535137411708 1.2833e-07 au
q 4.52884299086272 4.2679e-07 au
i 18.16692069328835 6.3824e-06 deg
node 100.747437836316 2.4286e-05 deg
peri 351.2942402365144 3.7369e-05 deg
M 223.4839127485978 3.2846e-05 deg
tp 2460287.435426211523
(2023-Dec-08.93542621)
0.00044697 TDB
period 4448.536181071292
12.18
0.00016176
4.429e-07
d
yr
n .08092549669075753 2.9427e-09 deg/d
Q 6.058227283960697 1.4687e-07 au
  Orbit Determination Parameters
   # obs. used (total)      776  
   data-arc span      10403 days (28.48 yr)  
   first obs. used      1991-05-08  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58963  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 04:24:49  

Additional Information
 Earth MOID = 3.5468 au 
 Jupiter MOID = .644599 au 
 T_jup = 2.880 
[ 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 11.1   n/a MPO492970  
diameter diameter 34.120 km 2.981 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
geometric albedo albedo 0.060   0.020 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

20720 (1999 XP101)          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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