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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 ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06901586958457491 3.2319e-08  
a 2.31322959462686 8.104e-09 au
q 2.153580042604914 7.7028e-08 au
i 4.480190550218182 3.5313e-06 deg
node 278.524156730386 4.6363e-05 deg
peri 325.7133880852504 5.4314e-05 deg
M 340.2223603058493 2.9251e-05 deg
tp 2459271.098991401634
(2021-Feb-25.59899140)
0.00010448 TDB
period 1285.069264969212
3.52
6.753e-06
1.849e-08
d
yr
n .2801405416918324 1.4721e-09 deg/d
Q 2.472879146648807 8.6633e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1938  
   data-arc span      18008 days (49.30 yr)  
   first obs. used      1971-02-18  
   last obs. used      2020-06-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49158  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:16:36  

Additional Information
 Earth MOID = 1.1401 au 
 Jupiter MOID = 2.53945 au 
 T_jup = 3.576 
[ 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 14.56   n/a E2021B10  
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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