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181700 (1981 EG2)
Classification: Main-belt Asteroid          SPK-ID: 2181700
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 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1995715910562238 5.8176e-08  
a 2.761690776834309 2.3265e-08 au
q 2.210535754496187 1.6667e-07 au
i 9.526747956962506 5.5626e-06 deg
node 236.8729588072935 3.8441e-05 deg
peri 244.714649910795 4.2293e-05 deg
M 272.4775426888778 1.9544e-05 deg
tp 2459608.047283757640
(2022-Jan-28.54728376)
9.415e-05 TDB
period 1676.33572754025
4.59
2.1182e-05
5.799e-08
d
yr
n .2147541176183374 2.7137e-09 deg/d
Q 3.312845799172431 2.7908e-08 au
  Orbit Determination Parameters
   # obs. used (total)      353  
   data-arc span      14552 days (39.84 yr)  
   first obs. used      1981-02-02  
   last obs. used      2020-12-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .60141  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:31:40  

Additional Information
 Earth MOID = 1.2459 au 
 Jupiter MOID = 1.90934 au 
 T_jup = 3.292 
[ 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 15.8   n/a MPO440018  

181700 (1981 EG2)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20080420/Numbers.arcLast Updated: 2008-04-23

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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