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21437 Georgechen (1998 FG117)
Classification: Main-belt Asteroid          SPK-ID: 2021437
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1911597724658346 3.9246e-08  
a 2.63491775527255 1.0786e-08 au
q 2.131227476708462 1.0616e-07 au
i 12.36196328517938 4.0985e-06 deg
node 211.0957744028623 1.9474e-05 deg
peri 114.2934017704634 2.2086e-05 deg
M 42.02704888622734 1.0025e-05 deg
tp 2459214.120753445740
(2020-Dec-30.62075345)
4.3219e-05 TDB
period 1562.244566285736
4.28
9.5929e-06
2.626e-08
d
yr
n .2304376713921985 1.415e-09 deg/d
Q 3.138608033836639 1.2848e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1548  
   data-arc span      9977 days (27.32 yr)  
   first obs. used      1994-04-15  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49936  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:42:33  

Additional Information
 Earth MOID = 1.15456 au 
 Jupiter MOID = 2.37084 au 
 T_jup = 3.339 
[ 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 13.91   n/a E2021B10  
diameter diameter 5.057 km 1.253 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 26.5562 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 0.173   0.113 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21437 Georgechen           Discovered 1998 Mar. 31 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
George Chen (b. 1988) was awarded first place in the 2006 Intel International Science and Engineering Fair for his computer science team project. He also received the MILSET Expo-Science Award. He attends the Monta Vista High School, Cupertino, California, U.S.A.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060711/MPCPages.arcLast Updated: 2006-07-17

Alternate Designations
 1998 FG117 = 1999 NB56 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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