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18318 (1981 ET43)
Classification: Main-belt Asteroid          SPK-ID: 2018318
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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09922592254848144 6.1063e-08  
a 3.125594475811528 2.4683e-08 au
q 2.815454480436693 1.8383e-07 au
i 27.60765418115674 7.081e-06 deg
node 190.6605828806947 9.6806e-06 deg
peri 342.3574705501097 2.8628e-05 deg
M 83.50166204976067 2.6617e-05 deg
tp 2458732.344648693706
(2019-Sep-05.84464869)
0.00014889 TDB
period 2018.354154074578
5.53
2.3909e-05
6.546e-08
d
yr
n .1783631476533716 2.1129e-09 deg/d
Q 3.435734471186365 2.7133e-08 au
  Orbit Determination Parameters
   # obs. used (total)      664  
   data-arc span      15276 days (41.82 yr)  
   first obs. used      1978-10-03  
   last obs. used      2020-07-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .57832  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:26:27  

Additional Information
 Earth MOID = 1.82416 au 
 Jupiter MOID = 1.53861 au 
 T_jup = 3.032 
[ 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 14.49   n/a E2021B10  
diameter diameter 7.070 km 0.148 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.067   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18318 (1981 ET43)          Discovered 1981-Mar-06 by Bus, S. J. at Siding Spring
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

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