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9281 Weryk (1981 EJ15)
Classification: Main-belt Asteroid          SPK-ID: 2009281
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1717038329873541 5.8155e-08  
a 2.44925076582254 1.4449e-08 au
q 2.028705021383598 1.3801e-07 au
i 2.196769953579217 6.0841e-06 deg
node 272.0635968911438 0.00013166 deg
peri 137.2901099656308 0.00013313 deg
M 198.0305528386039 2.0716e-05 deg
tp 2458230.410582734797
8.398e-05 JED
period 1400.065344166804
n .2571308557131955 2.2754e-09 deg/d
Q 2.869796510261482 1.693e-08 au
  Orbit Determination Parameters
   # obs. used (total)      980  
   data-arc span      13337 days (36.51 yr)  
   first obs. used      1979-10-14  
   last obs. used      2016-04-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51591  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 13:05:01  

Additional Information
 Earth MOID = 1.03814 au 
 Jupiter MOID = 2.50507 au 
 T_jup = 3.475 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.5 mag n/a MPO324395  

9281 Weryk           Discovered 1981 Mar. 1 by S. J. Bus at Siding Spring.
Robert J. Weryk (b. 1981) is a researcher at Mount Allison University in Sackville, New Brunswick, who has performed fundamental work on radar and optical measurements of meteors. In particular, his techniques for automatic real-time video detection of meteors are widely used.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2014-07-12Last Updated: 2014-08-13

Alternate Designations
 1981 EJ15 = 1979 TV1 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
FirstGov 2016-May-02 05:54 UT
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