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2221 Chilton (1976 QC)
Classification: Main-belt Asteroid          SPK-ID: 2002221
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1375875792927195 3.0146e-08  
a 2.591576898394655 1.0508e-08 au
q 2.235008106393601 7.7714e-08 au
i 13.79123375423115 4.426e-06 deg
node 245.817833435368 1.4019e-05 deg
peri 82.07625806042135 2.2223e-05 deg
M 195.6533702589692 1.7975e-05 deg
tp 2459696.169364306356
(2022-Apr-26.66936431)
7.7763e-05 TDB
period 1523.858271659847
4.17
9.2683e-06
2.538e-08
d
yr
n .2362424424207598 1.4369e-09 deg/d
Q 2.94814569039571 1.1954e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1810  
   data-arc span      15867 days (43.44 yr)  
   first obs. used      1976-08-25  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44232  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 16:15:35  

Additional Information
 Earth MOID = 1.2731 au 
 Jupiter MOID = 2.4148 au 
 T_jup = 3.366 
[ show covariance matrix ]

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 13.0   n/a MPO502174  
rotation period rot_per 7.445 h n/a LCDB (Rev. 2019-August); 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:
[Sada, P.V. (2006) Minor Planet Bull. 33, 78-79.]

2221 Chilton           Discovered 1976 Aug. 25 at the Harvard College Observatory, Agassiz Station.
Named in honor of Jean Chilton McCrosky, wife of Harvard-Smithsonian astronomer Richard E. McCrosky.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 5285Last Updated: 2007-10-23

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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