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100748 (1998 EW4)
Classification: Main-belt Asteroid          SPK-ID: 2100748
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 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2188744220930571 3.8634e-08  
a 2.328015272521696 8.4861e-09 au
q 1.818472275124698 9.0054e-08 au
i 5.234038611607323 5.034e-06 deg
node 149.6823562139544 4.8261e-05 deg
peri 115.4263315970922 4.9762e-05 deg
M 355.4551447838964 1.0997e-05 deg
tp 2459016.879276576218
(2020-Jun-16.37927658)
3.9658e-05 TDB
period 1297.409771502864
3.55
7.094e-06
1.942e-08
d
yr
n .2774759431501672 1.5172e-09 deg/d
Q 2.837558269918693 1.0343e-08 au
  Orbit Determination Parameters
   # obs. used (total)      445  
   data-arc span      21850 days (59.82 yr)  
   first obs. used      1960-09-24  
   last obs. used      2020-07-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .59605  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 09:04:01  

Additional Information
 Earth MOID = .81024 au 
 Jupiter MOID = 2.26825 au 
 T_jup = 3.535 
[ 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 16.6   n/a MPO267994  

100748 (1998 EW4)          Discovered 1998-Mar-01 by Spacewatch at Kitt Peak
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

[ show close-approach data ]
Alternate Designations
 1998 EW4 = 1999 RP80 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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