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123945 (2001 EM21)
Classification: Main-belt Asteroid          SPK-ID: 2123945
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 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1320026883743097 5.0746e-08  
a 3.162952799454166 3.2719e-08 au
q 2.745434526725167 1.5794e-07 au
i 4.029644603759845 5.3601e-06 deg
node 292.4081926586676 7.5451e-05 deg
peri 255.6467439114114 7.804e-05 deg
M 126.2877850158142 2.4284e-05 deg
tp 2458279.730602950695
(2018-Jun-10.23060295)
0.00013235 TDB
period 2054.648301142166
5.63
3.1882e-05
8.729e-08
d
yr
n .1752124681386484 2.7187e-09 deg/d
Q 3.580471072183165 3.7038e-08 au
  Orbit Determination Parameters
   # obs. used (total)      574  
   data-arc span      7541 days (20.65 yr)  
   first obs. used      1999-12-05  
   last obs. used      2020-07-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .59398  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 10:22:49  

Additional Information
 Earth MOID = 1.75012 au 
 Jupiter MOID = 1.42727 au 
 T_jup = 3.187 
[ 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 14.7   n/a MPO348222  

123945 (2001 EM21)          Discovered 2001-Mar-15 by LONEOS at Anderson Mesa
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

[ show close-approach data ]
Alternate Designations
 2001 EM21 = 1999 XQ237 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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