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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1460033479450291 5.6017e-08  
a 5.288638653754259 1.2376e-07 au
q 4.516479704234646 3.6415e-07 au
i 18.16639727781714 5.301e-06 deg
node 100.7428485114917 2.1346e-05 deg
peri 351.4680850619207 3.5365e-05 deg
M 272.0429857351551 3.3415e-05 deg
tp 2460285.881080511804
(2023-Dec-07.38108051)
0.00043892 TDB
period 4442.36531048805
12.16
0.00015593
4.269e-07
d
yr
n .08103790995082516 2.8445e-09 deg/d
Q 6.060797603273873 1.4182e-07 au
  Orbit Determination Parameters
   # obs. used (total)      989  
   data-arc span      10811 days (29.60 yr)  
   first obs. used      1991-05-08  
   last obs. used      2020-12-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54889  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:28:27  

Additional Information
 Earth MOID = 3.5341 au 
 Jupiter MOID = .658212 au 
 T_jup = 2.879 
[ 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 11.08   n/a E2021B10  
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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