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123941 (2001 EM18)
Classification: Main-belt Asteroid          SPK-ID: 2123941
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 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1717362713970151 4.6404e-08  
a 3.108550402437665 2.3403e-08 au
q 2.57469954687333 1.4123e-07 au
i 17.5434955376206 5.3572e-06 deg
node 150.5299534580315 1.3261e-05 deg
peri 56.86854501875465 1.8635e-05 deg
M 135.157746347019 1.3937e-05 deg
tp 2458248.922555721732
(2018-May-10.42255572)
7.4345e-05 TDB
period 2001.86735317035
5.48
2.2607e-05
6.189e-08
d
yr
n .1798320949836508 2.0308e-09 deg/d
Q 3.642401258002 2.7422e-08 au
  Orbit Determination Parameters
   # obs. used (total)      828  
   data-arc span      8446 days (23.12 yr)  
   first obs. used      1997-09-07  
   last obs. used      2020-10-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55655  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 17:31:22  

Additional Information
 Earth MOID = 1.619 au 
 Jupiter MOID = 1.49872 au 
 T_jup = 3.126 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457663.5 (2016-Oct-02.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1710115302011288 4.6496e-08  
q 2.578215674580973 1.4131e-07 au
tp 2458250.984402342356
(2018-May-12.48440234)
7.4642e-05 TDB
node 150.6157103825755 1.3262e-05 deg
peri 57.29608048382489 1.8698e-05 deg
i 17.53710828012887 5.3571e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      828  
   data-arc span      8446 days (23.12 yr)  
   first obs. used      1997-09-07  
   last obs. used      2020-10-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55655  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 17:31:22  

Additional Information
 Jupiter MOID = 1.49872 au 
 T_jup = 3.126 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.161894640536587E-15 -6.511027982458391E-15 -6.169193200180035E-13 1.246815319886587E-15 -1.94806131878095E-13 -3.018913812170399E-16
q -6.511027982458391E-15 1.996759878264019E-14 2.360138803141068E-12 -3.936631816242818E-15 6.495851112250516E-13 1.941756620849645E-15
tp -6.169193200180035E-13 2.360138803141068E-12 5.571451647185097E-9 -1.506976396662804E-11 9.877748030156526E-10 -5.106057485449958E-12
node 1.246815319886587E-15 -3.936631816242818E-15 -1.506976396662804E-11 1.758903941658935E-10 -1.70070378280344E-10 1.706577356998438E-11
peri -1.94806131878095E-13 6.495851112250516E-13 9.877748030156526E-10 -1.70070378280344E-10 3.496205048733858E-10 -1.723964459427682E-11
i -3.018913812170399E-16 1.941756620849645E-15 -5.106057485449958E-12 1.706577356998438E-11 -1.723964459427682E-11 2.86979848184507E-11

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 14.3   n/a MPO493706  

123941 (2001 EM18)          Discovered 2001-Mar-13 by LONEOS at Anderson Mesa
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

[ show close-approach data ]
Alternate Designations
 2001 EM18 = 2002 LY6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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