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

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2089358052506588 9.577e-09  
a 2.734257811617119 8.0183e-09 au
q 2.162973453983992 2.5995e-08 au
i 9.80821039062775 2.7862e-07 deg
node 161.9731523032407 2.3523e-06 deg
peri .6123506764154343 7.0363e-06 deg
M 93.10036100408675 5.8867e-06 deg
tp 2458969.422704936638
2.6626e-05 TDB
period 1651.420301324732
n .217994171266525 9.5892e-10 deg/d
Q 3.305542169250247 9.6937e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2421  
   data-arc span      14520 days (39.75 yr)  
   first obs. used      1981-08-30  
   last obs. used      2021-06-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45494  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 14:47:15  

Additional Information
 Earth MOID = 1.17196 au 
 Jupiter MOID = 1.67251 au 
 T_jup = 3.300 
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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 13.45   n/a E2021B10  
diameter diameter 9.984 km 0.180 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 6.95582 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.112   0.025 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
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

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Alternate Designations
 1984 CM1 = 1981 QC4 
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