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21425 Cordwell (1998 FR90)
Classification: Main-belt Asteroid          SPK-ID: 2021425
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1258888362851143 3.4879e-08  
a 2.294978790489327 5.7885e-09 au
q 2.006066581255607 7.9284e-08 au
i 4.508599904150807 2.8946e-06 deg
node 104.4070347958838 4.8241e-05 deg
peri 218.1232752114195 4.9964e-05 deg
M 53.71982263816084 1.2903e-05 deg
tp 2459011.004670378566
(2020-Jun-10.50467038)
4.5587e-05 TDB
period 1269.890988345451
3.48
4.8045e-06
1.315e-08
d
yr
n .2834889004677845 1.0725e-09 deg/d
Q 2.583890999723048 6.5172e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2003  
   data-arc span      10969 days (30.03 yr)  
   first obs. used      1991-02-22  
   last obs. used      2021-03-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49109  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:45:24  

Additional Information
 Earth MOID = .993598 au 
 Jupiter MOID = 2.68705 au 
 T_jup = 3.581 
[ 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 14.78   n/a E2021B10  

21425 Cordwell           Discovered 1998 Mar. 24 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Robert Thomas Cordwell (b. 1987) is a finalist in the 2005 Intel Science Talent Search, a science competition for high school seniors, for his mathematics project. He attends the Manzano High School, Albuquerque, New Mexico.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050224/MPCPages.arcLast Updated: 2005-02-28

[ show close-approach data ]
Alternate Designations
 1998 FR90 = 1978 NK8 = 1999 RG62 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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