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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .16105100418725 9.8096e-08  
a 2.686044277604704 2.4818e-08 AU
q 2.253454149405051 2.7021e-07 AU
i 12.77963009698198 9.3563e-06 deg
node 228.131467787349 3.4211e-05 deg
peri 170.6213609692917 4.2047e-05 deg
M 9.558898669938538 2.5989e-05 deg
tp 2456757.805342386944
(2014-Apr-10.30534239)
0.00011585 JED
period 1607.933850061296
4.40
2.2285e-05
6.101e-08
d
yr
n .2238898073986542 3.103e-09 deg/d
Q 3.118634405804358 2.8815e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      667  
   data-arc span      9584 days (26.24 yr)  
   first obs. used      1987-10-25  
   last obs. used      2014-01-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .60184  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Feb-19 18:24:49  

Additional Information
 Earth MOID = 1.26141 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 13.7 mag n/a PDS3 (MPO 2828)  

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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