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18310 (1981 EJ16)
Classification: Main-belt Asteroid          SPK-ID: 2018310
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 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1030433016743833 3.4752e-08  
a 2.32659376071266 9.7666e-09 au
q 2.086853857953808 8.3397e-08 au
i 6.501157330147458 4.8736e-06 deg
node 343.4836193490866 3.2251e-05 deg
peri 286.6381657765667 4.3103e-05 deg
M 355.8871082494216 3.1133e-05 deg
tp 2459215.308942402077
(2020-Dec-31.80894240)
0.00011213 TDB
period 1296.221633841448
3.55
8.1619e-06
2.235e-08
d
yr
n .2777302820761552 1.7488e-09 deg/d
Q 2.566333663471513 1.0773e-08 au
  Orbit Determination Parameters
   # obs. used (total)      827  
   data-arc span      14345 days (39.27 yr)  
   first obs. used      1981-02-12  
   last obs. used      2020-05-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .57039  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:26:21  

Additional Information
 Earth MOID = 1.08028 au 
 Jupiter MOID = 2.53613 au 
 T_jup = 3.558 
[ 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 15.77   n/a E2021B10  
diameter diameter 1.741 km 0.137 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.368   0.150 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18310 (1981 EJ16)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EJ16 = 1996 PR4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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