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21398 Zengguoshou (1998 FX55)
Classification: Main-belt Asteroid          SPK-ID: 2021398
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1658761756101959 2.57e-08  
a 2.233968097058655 6.1413e-09 au
q 1.863406012683378 5.7698e-08 au
i 3.605748283486812 9.8122e-07 deg
node 115.6730198481458 2.3527e-05 deg
peri 270.3660695125535 2.4813e-05 deg
M 82.00282306493018 8.3743e-06 deg
tp 2458922.694921928997
(2020-Mar-14.19492193)
2.7898e-05 TDB
period 1219.59006248325
3.34
5.0291e-06
1.377e-08
d
yr
n .2951811523185024 1.2172e-09 deg/d
Q 2.604530181433931 7.16e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2003  
   data-arc span      16215 days (44.39 yr)  
   first obs. used      1976-10-22  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48113  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:44:47  

Additional Information
 Earth MOID = .870476 au 
 Jupiter MOID = 2.84625 au 
 T_jup = 3.619 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.4   n/a MPO337439  

21398 Zengguoshou           Discovered 1998 Mar. 20 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Zeng Guoshou (b. 1944), a 2003 Intel International Science and Engineering Fair Excellence in Teaching Award finalist, is a teacher at the First Middle School of Xiamen, Fujian, China.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20041226/MPCPages.arcLast Updated: 2004-12-25

Alternate Designations
 1998 FX55 = 1976 UZ16 = 1986 VA9 = 1986 VH4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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