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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 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1613071021409256 9.7791e-08  
a 2.687101663890904 2.9046e-08 AU
q 2.253653081330603 2.7318e-07 AU
i 12.77707872195988 8.6795e-06 deg
node 228.1209005342361 3.2231e-05 deg
peri 170.7172240117889 3.9247e-05 deg
M 54.24023954251133 2.5257e-05 deg
tp 2456758.093828918279
(2014-Apr-10.59382892)
0.0001113 JED
period 1608.883410646146
4.40
2.6087e-05
7.142e-08
d
yr
n .2237576679688802 3.628e-09 deg/d
Q 3.120550246451205 3.3731e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      665  
   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      .57209  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 21:33:51  

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 13.7 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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