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20728 (1999 XD143)
Classification: Main-belt Asteroid          SPK-ID: 2020728
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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1750123119461481 3.4851e-08  
a 2.218758284601104 6.1957e-09 au
q 1.830448267563395 7.5237e-08 au
i 4.763775399134735 3.5087e-06 deg
node 175.8787396120374 4.2473e-05 deg
peri 202.868394646407 4.3836e-05 deg
M 87.89973912055595 1.0213e-05 deg
tp 2458705.753606197924
(2019-Aug-10.25360620)
3.4195e-05 TDB
period 1207.156048816227
3.31
5.0563e-06
1.384e-08
d
yr
n .2982215931014277 1.2491e-09 deg/d
Q 2.607068301638813 7.28e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1696  
   data-arc span      23193 days (63.50 yr)  
   first obs. used      1956-10-11  
   last obs. used      2020-04-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48639  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:01:03  

Additional Information
 Earth MOID = .833261 au 
 Jupiter MOID = 2.85346 au 
 T_jup = 3.627 
[ 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 14.7   n/a MPO502322  
diameter diameter 3.318 km 0.439 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.306   0.117 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20728 (1999 XD143)          Discovered 1999-Dec-14 by Juels, C. W. at Fountain Hills
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 XD143 = 1956 TS = 1998 HK82 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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