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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1613071690618828 7.0321e-08  
a 2.687101649096732 2.4796e-08 AU
q 2.253652889099421 1.9102e-07 AU
i 12.77708084383071 7.7059e-06 deg
node 228.1208942478757 3.0746e-05 deg
peri 170.717227216303 3.7783e-05 deg
M 54.24024935080218 2.2764e-05 deg
tp 2456758.093787085741
(2014-Apr-10.59378709)
0.00010095 JED
period 1608.883397359285
4.40
2.227e-05
6.097e-08
d
yr
n .2237576698167687 3.0972e-09 deg/d
Q 3.120550409094042 2.8796e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      723  
   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      .55589  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Feb-04 13:46:10  

Additional Information
 Earth MOID = 1.26254 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 (399)
Reference: 20000913/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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