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173609 (2001 EC21)
Classification: Main-belt Asteroid          SPK-ID: 2173609
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04820717513981354 5.7633e-08  
a 2.274691958918262 1.3963e-08 au
q 2.165035485265564 1.3035e-07 au
i 6.452185120560807 6.5746e-06 deg
node 323.3970250522194 4.8532e-05 deg
peri 170.9936114174648 8.5995e-05 deg
M 245.2161613543772 6.807e-05 deg
tp 2459400.040270372683
(2021-Jul-04.54027037)		 0.00023684 TDB
period 1253.090147805847
3.43		 1.1538e-05
3.159e-08		 d
yr
n .2872897856793127 2.6452e-09 deg/d
Q 2.384348432570961 1.4636e-08 au
   Orbit Determination Parameters
   # obs. used (total)      469  
   data-arc span      9353 days (25.61 yr)  
   first obs. used      1992-09-30  
   last obs. used      2018-05-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55987  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 12:32:18  

Additional Information
 Earth MOID = 1.17886 au 
 Jupiter MOID = 2.62128 au 
 T_jup = 3.600 
[ 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 16.4   n/a MPO385762  

173609 (2001 EC21)          Discovered 2001-Mar-15 by LONEOS at Anderson Mesa
Reference: 20080122/Numbers.arcLast Updated: 2008-01-28

[ show close-approach data ]
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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