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99891 Donwells (2002 PG165)
Classification: Main-belt Asteroid          SPK-ID: 2099891
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 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04534230182987352 1.1312e-07  
a 3.064016107137753 4.9822e-08 au
q 2.925086563996319 3.4333e-07 au
i 4.949041086858555 9.108e-06 deg
node 297.0902717600461 0.00010967 deg
peri 28.78913491530626 0.00014956 deg
M 224.2763563116199 0.00010955 deg
tp 2458339.063774753743
0.00060452 JED
period 1959.002511911717
n .1837669925439194 4.4822e-09 deg/d
Q 3.202945650279187 5.2081e-08 au
  Orbit Determination Parameters
   # obs. used (total)      335  
   data-arc span      10762 days (29.46 yr)  
   first obs. used      1986-10-21  
   last obs. used      2016-04-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .58488  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 15:51:00  

Additional Information
 Earth MOID = 1.91326 au 
 Jupiter MOID = 1.98501 au 
 T_jup = 3.226 
[ 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 15.1 mag n/a MPO351560  

99891 Donwells           Discovered 2002 Aug. 9 by A. Lowe on images taken at Haleakala.
Don J. Wells (b. 1965), husband of Donna and father of Chris, Duncan and Katy, is an award-winning production manager of a Houston-area television station. He has discovered a number of minor planets at the George Observatory, Needville, and at the RAS Observatory, Mayhill.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20080618/MPCPages.arcLast Updated: 2008-06-20
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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