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30744 (1981 EN18)
Classification: Main-belt Asteroid          SPK-ID: 2030744
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 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1073430805804022 5.2236e-08  
a 3.138824617807097 2.5321e-08 au
q 2.80189351393008 1.5648e-07 au
i 5.46383513400974 6.4688e-06 deg
node 199.0466374192154 4.4759e-05 deg
peri 307.1038358159683 5.1812e-05 deg
M 82.14516009638579 2.5615e-05 deg
tp 2458737.022685755815
(2019-Sep-10.52268576)
0.00014382 TDB
period 2031.182761493551
5.56
2.4578e-05
6.729e-08
d
yr
n .1772366361239144 2.1447e-09 deg/d
Q 3.475755721684114 2.8039e-08 au
  Orbit Determination Parameters
   # obs. used (total)      501  
   data-arc span      14398 days (39.42 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-07-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56683  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 06:39:38  

Additional Information
 Earth MOID = 1.81763 au 
 Jupiter MOID = 1.55598 au 
 T_jup = 3.195 
[ 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 15.13   n/a E2021B10  

30744 (1981 EN18)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20011130/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EN18 = 1998 HR73 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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