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18311 (1981 EV16)
Classification: Main-belt Asteroid          SPK-ID: 2018311
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1627529244485481 3.7257e-08  
a 2.346237688823177 1.1127e-08 au
q 1.964380643515802 8.8178e-08 au
i 5.947721066549595 4.4319e-06 deg
node 311.8042473149922 4.0048e-05 deg
peri 346.2680115551408 4.2277e-05 deg
M 281.4303827706519 1.4499e-05 deg
tp 2459486.989410438318
(2021-Sep-29.48941044)
5.3839e-05 TDB
period 1312.67265127098
3.59
9.3378e-06
2.557e-08
d
yr
n .2742496384391296 1.9509e-09 deg/d
Q 2.728094734130551 1.2938e-08 au
  Orbit Determination Parameters
   # obs. used (total)      787  
   data-arc span      14587 days (39.94 yr)  
   first obs. used      1981-03-06  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5088  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:26:22  

Additional Information
 Earth MOID = .947286 au 
 Jupiter MOID = 2.48236 au 
 T_jup = 3.536 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.78   n/a MPCxxxxx  
diameter diameter 2.121 km 0.414 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.135   0.077 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18311 (1981 EV16)          Discovered 1981-Mar-06 by Bus, S. J. at Siding Spring
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 EV16 = 2000 RW63 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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