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17876 (1999 AX21)
Classification: Main-belt Asteroid          SPK-ID: 2017876
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ 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 .06907822951643622 3.3219e-08  
a 2.313567321946745 8.3263e-09 au
q 2.153750187479581 7.8706e-08 au
i 4.480209810365738 3.6346e-06 deg
node 278.5263827888792 4.8011e-05 deg
peri 325.5969459979466 5.5776e-05 deg
M 284.3110001898896 2.9268e-05 deg
tp 2459270.741413979832
(2021-Feb-25.24141398)
0.00010471 TDB
period 1285.350701909319
3.52
6.9388e-06
1.9e-08
d
yr
n .2800792028706558 1.512e-09 deg/d
Q 2.473384456413909 8.9014e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1765  
   data-arc span      17883 days (48.96 yr)  
   first obs. used      1971-02-18  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49746  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 22:14:04  

Additional Information
 Earth MOID = 1.14184 au 
 Jupiter MOID = 2.53995 au 
 T_jup = 3.575 
[ 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 14.5   n/a MPO347664  
diameter diameter 7.910 km 0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.052   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

17876 (1999 AX21)          Discovered 1999-Jan-15 by Korlevic, K. at Visnjan
Reference: 20001013/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 AX21 = 1971 DR1 = 1978 EA8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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