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16420 (1987 UN1)
Classification: Main-belt Asteroid          SPK-ID: 2016420
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1622641582956095 6.5756e-08  
a 2.686786915680944 2.4701e-08 au
q 2.250817698288319 1.7765e-07 au
i 12.78489945421879 7.3894e-06 deg
node 228.0073344301061 3.0466e-05 deg
peri 170.8354294681033 3.7398e-05 deg
M 143.6378978830173 2.2624e-05 deg
tp 2456758.677698112488
(2014-Apr-11.17769811)
9.903e-05 JED
period 1608.600738975467
4.40
2.2183e-05
6.073e-08
d
yr
n .2237969878276242 3.0862e-09 deg/d
Q 3.122756133073568 2.8709e-08 au
  Orbit Determination Parameters
   # obs. used (total)      770  
   data-arc span      9954 days (27.25 yr)  
   first obs. used      1987-10-25  
   last obs. used      2015-01-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53927  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Apr-07 16:55:27  

Additional Information
 Earth MOID = 1.25868 au 
 Jupiter MOID = 2.29295 au 
 T_jup = 3.320 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.8 mag n/a MPO309282  

16420 (1987 UN1)          Discovered 1987-Oct-28 by Ueda, S., Kaneda, H. at Kushiro
Reference: 20000913/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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