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20656 (1999 TX258)
Classification: Outer Main-belt Asteroid          SPK-ID: 2020656
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1398153582820626 4.3558e-08  
a 3.206312830512425 2.0803e-08 au
q 2.758021053349956 1.4913e-07 au
i 2.027896000659768 4.5599e-06 deg
node 41.62358113107483 0.00012463 deg
peri 216.3245948237188 0.00012609 deg
M 348.9169611752636 2.2373e-05 deg
tp 2459265.060014623774
(2021-Feb-19.56001462)
0.0001306 TDB
period 2097.042664209133
5.74
2.0408e-05
5.587e-08
d
yr
n .1716703270487672 1.6707e-09 deg/d
Q 3.654604607674894 2.3711e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1176  
   data-arc span      9766 days (26.74 yr)  
   first obs. used      1993-09-15  
   last obs. used      2020-06-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55244  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:26:09  

Additional Information
 Earth MOID = 1.74161 au 
 Jupiter MOID = 1.406 au 
 T_jup = 3.176 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.09   n/a E2021B10  
diameter diameter 7.881 km 0.318 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.071   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20656 (1999 TX258)          Discovered 1999-Oct-09 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 TX258 = 1996 BD15 = 1997 EU47 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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