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21416 Sisichen (1998 FN70)
Classification: Main-belt Asteroid          SPK-ID: 2021416
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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1513148029891651 3.518e-08  
a 2.413176220678816 8.9746e-09 au
q 2.048026936268663 8.3906e-08 au
i 6.51797991946156 4.3214e-06 deg
node 30.80821678435385 2.688e-05 deg
peri 292.5403986360734 3.0138e-05 deg
M 266.6685013855323 1.5057e-05 deg
tp 2459555.483135501959
(2021-Dec-06.98313550)
5.8105e-05 TDB
period 1369.247581768661
3.75
7.6384e-06
2.091e-08
d
yr
n .2629181199903869 1.4667e-09 deg/d
Q 2.778325505088969 1.0333e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1552  
   data-arc span      13044 days (35.71 yr)  
   first obs. used      1984-09-23  
   last obs. used      2020-06-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54662  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:57:08  

Additional Information
 Earth MOID = 1.04499 au 
 Jupiter MOID = 2.55573 au 
 T_jup = 3.494 
[ 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 14.83   n/a E2021B10  

21416 Sisichen           Discovered 1998 Mar. 20 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Sisi Monica Chen (b. 1987) is a finalist in the 2005 Intel Science Talent Search, a science competition for high school seniors, for her mathematics project. She 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: 20050224/MPCPages.arcLast Updated: 2005-02-28

[ show close-approach data ]
Alternate Designations
 1998 FN70 = 1984 SO6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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