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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1694073690238214 3.0697e-08  
a 3.184354465939298 1.9187e-08 au
q 2.644901353825265 9.9553e-08 au
i 9.8895430626589 4.1729e-06 deg
node 205.2921579523009 2.1365e-05 deg
peri 79.38648334443182 2.5456e-05 deg
M 243.6678286764955 1.6882e-05 deg
tp 2459671.199323188911
(2022-Apr-01.69932319)
0.00010102 TDB
period 2075.537261971687
5.68
1.8758e-05
5.136e-08
d
yr
n .1734490662229849 1.5676e-09 deg/d
Q 3.72380757805333 2.2437e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1490  
   data-arc span      14320 days (39.21 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-04-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54152  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 04:47:38  

Additional Information
 Earth MOID = 1.65183 au 
 Jupiter MOID = 1.53783 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 13.4   n/a MPO247522  
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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