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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 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1613071710053995 6.5669e-08  
a 2.687101648663944 2.416e-08 AU
q 2.253652883514018 1.7682e-07 AU
i 12.77708033354039 7.3856e-06 deg
node 228.1208951050541 3.0491e-05 deg
peri 170.7172261926877 3.752e-05 deg
M 54.2402497436001 2.2469e-05 deg
tp 2456758.093785388843
(2014-Apr-10.59378539)
9.974e-05 JED
period 1608.883396970592
4.40
2.1698e-05
5.941e-08
d
yr
n .2237576698708267 3.0177e-09 deg/d
Q 3.120550413813869 2.8057e-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 = 1.26254 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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