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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 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1613071701981746 6.9554e-08  
a 2.687101648839785 2.4689e-08 AU
q 2.25365288583059 1.8868e-07 AU
i 12.77708054499571 7.6579e-06 deg
node 228.1208947230648 3.0713e-05 deg
peri 170.717226640958 3.7747e-05 deg
M 54.24024958421404 2.2714e-05 deg
tp 2456758.093786077364
(2014-Apr-10.59378608)
0.00010074 JED
period 1608.883397128517
4.40
2.2174e-05
6.071e-08
d
yr
n .223757669848863 3.0838e-09 deg/d
Q 3.12055041184898 2.8672e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      766  
   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      .54063  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Mar-09 14:46:29  

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
Reference: 20000913/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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