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5553 Chodas (1984 CM1)
Classification: Main-belt Asteroid          SPK-ID: 2005553
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2101648673476892 4.7612e-08  
a 2.733121661662456 1.3732e-08 au
q 2.15871551019407 1.2953e-07 au
i 9.809967904615549 5.4192e-06 deg
node 161.9953314648203 3.2447e-05 deg
peri .5223054524745373 3.5794e-05 deg
M 61.57235956886423 1.5497e-05 deg
tp 2457318.226460292780
6.9878e-05 JED
period 1650.391100911866
n .2181301146141024 1.6439e-09 deg/d
Q 3.307527813130842 1.6617e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1228  
   data-arc span      12648 days (34.63 yr)  
   first obs. used      1981-08-30  
   last obs. used      2016-04-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50099  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 12:52:32  

Additional Information
 Earth MOID = 1.16597 au 
 Jupiter MOID = 1.67668 au 
 T_jup = 3.300 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.4 mag n/a MPO365315  
SMASSII spectral type spec_B Ch   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

5553 Chodas           Discovered 1984 Feb. 6 by E. Bowell at the Anderson Mesa Station of the Lowell Observatory.
Paul W. Chodas (1952- ) is a member of the Solar System Dynamics Group at the Jet Propulsion Laboratory. His work has contributed to the understanding of cometary nongravitational forces, the use of radar data in asteroidal and cometary orbits, orbital error analyses, earth close approaches and impact probabilities. He developed the system that allowed the use of radar landmark data on the surface of Venus for improved orbital solutions of the Magellan spacecraft. Citation prepared by D. K. Yeomans, a colleague of the honoree.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC22831Last Updated: 2005-11-23

[ show close-approach data ]
Alternate Designations
 1984 CM1 = 1981 QC4 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2016-May-03 01:08 UT
(server date/time)  
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