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21383 (1998 EC9)
Classification: Main-belt Asteroid          SPK-ID: 2021383
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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .259346539899064 4.629e-08  
a 2.548943070513237 1.0571e-08 au
q 1.887883504775933 1.1793e-07 au
i 6.313953175253054 4.7291e-06 deg
node 86.25063154695124 3.1509e-05 deg
peri 178.0908725634177 3.2184e-05 deg
M 136.0496140838172 8.6095e-06 deg
tp 2458638.762465195356
(2019-Jun-04.26246520)
3.3985e-05 TDB
period 1486.410041597657
4.07
9.247e-06
2.532e-08
d
yr
n .2421942734005325 1.5067e-09 deg/d
Q 3.210002636250541 1.3313e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1226  
   data-arc span      10725 days (29.36 yr)  
   first obs. used      1991-10-02  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53152  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:44:27  

Additional Information
 Earth MOID = .870401 au 
 Jupiter MOID = 1.88274 au 
 T_jup = 3.385 
[ 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 14.4   n/a MPO435898  
diameter diameter 3.079 km 0.334 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.355   0.187 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21383 (1998 EC9)          Discovered 1998-Mar-02 by Beijing Schmidt CCD Asteroid Program at Xinglong
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 EC9 = 1999 RA180 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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