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21857 (1999 TJ154)
Classification: Main-belt Asteroid          SPK-ID: 2021857
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06976051025887586 3.9688e-08  
a 2.851495812690399 1.2995e-08 au
q 2.652574009796069 1.1306e-07 au
i 2.457007212554882 4.4961e-06 deg
node 152.8453182575202 8.6393e-05 deg
peri 175.7730263024453 9.0669e-05 deg
M 236.3520847061909 2.8125e-05 deg
tp 2460000.576348297997
(2023-Feb-25.07634830)
0.00013794 TDB
period 1758.763864886344
4.82
1.2023e-05
3.292e-08
d
yr
n .2046892179145744 1.3993e-09 deg/d
Q 3.050417615584729 1.3902e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1916  
   data-arc span      9748 days (26.69 yr)  
   first obs. used      1994-10-04  
   last obs. used      2021-06-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49346  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:37:14  

Additional Information
 Earth MOID = 1.64043 au 
 Jupiter MOID = 2.18335 au 
 T_jup = 3.300 
[ 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 13.93   n/a MPO636391  
diameter diameter 4.852 km 0.438 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.248   0.041 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21857 (1999 TJ154)          Discovered 1999-Oct-07 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 TJ154 = 1994 TA7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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