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18843 Ningzhou (1999 RK22)
Classification: Main-belt Asteroid          SPK-ID: 2018843
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .172934359272409 3.1758e-08  
a 2.999859455529581 1.385e-08 au
q 2.481080682680295 9.8002e-08 au
i 1.4878936954997 3.6628e-06 deg
node 45.71915296290575 0.00015854 deg
peri 67.40597143421489 0.000159 deg
M 293.7524181924836 1.2779e-05 deg
tp 2459549.734643729816
(2021-Dec-01.23464373)
6.8248e-05 TDB
period 1897.797146891015
5.20
1.3143e-05
3.598e-08
d
yr
n .1896936142989542 1.3137e-09 deg/d
Q 3.518638228378866 1.6245e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1493  
   data-arc span      17335 days (47.46 yr)  
   first obs. used      1973-09-19  
   last obs. used      2021-03-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48587  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:39:28  

Additional Information
 Earth MOID = 1.49798 au 
 Jupiter MOID = 1.59458 au 
 T_jup = 3.230 
[ 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 14.25   n/a E2021B10  

18843 Ningzhou           Discovered 1999 Sept. 7 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Ning Zhou (b. 1987) is a finalist in the 2004 Intel Science Talent Search, a science competition for high school seniors. He was also awarded third place in the 2003 Intel International Science and Engineering Fair for his medicine and health project. He attends the Wayzata High School, Plymouth, Minnesota.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040415/MPCPages.arcLast Updated: 2004-04-20

[ show close-approach data ]
Alternate Designations
 1999 RK22 = 1991 EE3 = 3318 T-2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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