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20205 Sitanchen (1997 EJ34)
Classification: Main-belt Asteroid          SPK-ID: 2020205
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01037915341258245 5.0923e-08  
a 2.71649297462221 1.4608e-08 au
q 2.688298077294403 1.4196e-07 au
i 3.026601611780059 4.7784e-06 deg
node 37.70431780443636 8.571e-05 deg
peri 310.406770906548 0.00019227 deg
M 224.4647794356723 0.00017264 deg
tp 2459616.188401435210
(2022-Feb-05.68840144)
0.00078452 TDB
period 1635.35222500691
4.48
1.3191e-05
3.611e-08
d
yr
n .2201360627362578 1.7756e-09 deg/d
Q 2.744687871950017 1.4759e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1149  
   data-arc span      15532 days (42.52 yr)  
   first obs. used      1977-10-18  
   last obs. used      2020-04-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53421  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 05:09:54  

Additional Information
 Earth MOID = 1.68079 au 
 Jupiter MOID = 2.26359 au 
 T_jup = 3.358 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457050.5 (2015-Jan-28.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .008485585375959252 5.0798e-08  
q 2.696129606097858 1.413e-07 au
tp 2456344.999095269125
(2013-Feb-21.49909527)
0.00095985 TDB
node 37.74963181608136 8.5741e-05 deg
peri 310.7152709575124 0.0002274 deg
i 3.025639671036786 4.7747e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1149  
   data-arc span      15532 days (42.52 yr)  
   first obs. used      1977-10-18  
   last obs. used      2020-04-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53421  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 05:09:54  

Additional Information
 Jupiter MOID = 2.26359 au 
 T_jup = 3.358 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.580465137222648E-15 -7.141020298293012E-15 7.478358259767612E-12 -5.22469754004112E-15 1.616175948735715E-12 2.92543894495979E-16
q -7.141020298293012E-15 1.996481167880615E-14 -2.001931854210434E-11 1.466045334281846E-14 -4.306402436443651E-12 -8.112152260389864E-16
tp 7.478358259767612E-12 -2.001931854210434E-11 9.213053291159252E-7 5.708188927938743E-11 2.021793136119034E-7 -3.731418745120569E-12
node -5.22469754004112E-15 1.466045334281846E-14 5.708188927938743E-11 7.351463893064442E-9 -7.328408802738564E-9 -1.831163533939199E-10
peri 1.616175948735715E-12 -4.306402436443651E-12 2.021793136119034E-7 -7.328408802738564E-9 5.170926714847925E-8 1.820540250285688E-10
i 2.92543894495979E-16 -8.112152260389864E-16 -3.731418745120569E-12 -1.831163533939199E-10 1.820540250285688E-10 2.279737996327514E-11

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 14.6   n/a MPO431732  
diameter diameter 3.795 km 0.621 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.213   0.103 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20205 Sitanchen           Discovered 1997 Mar. 4 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Sitan Chen (b. 1995) is a finalist in the 2012 Intel Science Talent Search, a science competition for high-school seniors, for his mathematics project. He attends the Northview High School, Duluth, Georgia.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20120506/MPCPages.arcLast Updated: 2012-05-09

[ show close-approach data ]
Alternate Designations
 1997 EJ34 = 1977 UZ3 = 1999 RR171 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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