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18309 (1981 EV13)
Classification: Main-belt Asteroid          SPK-ID: 2018309
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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1694430002689871 2.9462e-08  
a 3.18358367350728 1.7608e-08 au
q 2.644147704260843 9.7243e-08 au
i 9.890952666930703 4.1643e-06 deg
node 205.2853205649724 2.0458e-05 deg
peri 79.47675227490784 2.436e-05 deg
M 278.273701370214 1.5755e-05 deg
tp 2459671.512203642988
(2022-Apr-02.01220364)
9.2933e-05 TDB
period 2074.783712885245
5.68
1.7213e-05
4.713e-08
d
yr
n .1735120618907188 1.4395e-09 deg/d
Q 3.723019642753717 2.0592e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1598  
   data-arc span      14652 days (40.11 yr)  
   first obs. used      1981-02-09  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53765  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 02:42:30  

Additional Information
 Earth MOID = 1.64927 au 
 Jupiter MOID = 1.53823 au 
 T_jup = 3.153 
[ 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 13.44   n/a MPCxxxxx  
diameter diameter 6.746 km 0.223 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.204   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18309 (1981 EV13)          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 EV13 = 1998 FH121 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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