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21823 (1999 TX72)
Classification: Main-belt Asteroid          SPK-ID: 2021823
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1832275802574126 3.487e-08  
a 2.417292489561318 7.1684e-09 au
q 1.974377835924581 8.4948e-08 au
i 3.303630916304045 3.6082e-06 deg
node 101.6187209776726 6.2914e-05 deg
peri 197.7894663202147 6.3616e-05 deg
M 4.229365660092765 9.713e-06 deg
tp 2459380.372577449982
(2021-Jun-14.87257745)
3.7034e-05 TDB
period 1372.752460916086
3.76
6.1063e-06
1.672e-08
d
yr
n .2622468436587316 1.1665e-09 deg/d
Q 2.860207143198056 8.4818e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1591  
   data-arc span      8952 days (24.51 yr)  
   first obs. used      1997-02-04  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50061  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:45:55  

Additional Information
 Earth MOID = .958519 au 
 Jupiter MOID = 2.35175 au 
 T_jup = 3.490 
[ 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 14.89   n/a MPO636391  
diameter diameter 2.798 km 0.069 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.326   0.055 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21823 (1999 TX72)          Discovered 1999-Oct-09 by Spacewatch at Kitt Peak
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 TX72 = 1998 KH20 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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