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120212 (2004 EM54)
Classification: Main-belt Asteroid          SPK-ID: 2120212
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 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .14241708184267 3.4361e-08  
a 2.294985810570186 7.9119e-09 au
q 1.968140628558445 7.8981e-08 au
i 6.407582243447954 6.7597e-06 deg
node 178.1793781563067 3.8628e-05 deg
peri 129.8673161462297 4.6806e-05 deg
M 189.1105595279653 2.7786e-05 deg
tp 2459803.310989382260
(2022-Aug-11.81098938)
9.9021e-05 TDB
period 1269.896815029519
3.48
6.5669e-06
1.798e-08
d
yr
n .2834875997319764 1.466e-09 deg/d
Q 2.621830992581926 9.0387e-09 au
  Orbit Determination Parameters
   # obs. used (total)      568  
   data-arc span      10715 days (29.34 yr)  
   first obs. used      1991-09-15  
   last obs. used      2021-01-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49961  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 19:37:17  

Additional Information
 Earth MOID = .959149 au 
 Jupiter MOID = 2.63006 au 
 T_jup = 3.574 
[ 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 16.5   n/a MPO432704  

120212 (2004 EM54)          Discovered 2004-Mar-13 by NEAT at Palomar
Reference: 20051116/Numbers.arcLast Updated: 2005-11-21

[ show close-approach data ]
Alternate Designations
 2004 EM54 = 1997 GH45 = 1998 SJ102 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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