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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 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1613071291145701 7.4075e-08  
a 2.687101657970421 2.5329e-08 AU
q 2.253653003884212 2.0239e-07 AU
i 12.77708049735777 7.9658e-06 deg
node 228.1208951584578 3.0932e-05 deg
peri 170.7172278237662 3.7975e-05 deg
M 54.24024371535886 2.3009e-05 deg
tp 2456758.093811070459
(2014-Apr-10.59381107)
0.00010195 JED
period 1608.883405328875
4.40
2.2749e-05
6.228e-08
d
yr
n .223757668708387 3.1638e-09 deg/d
Q 3.120550312056631 2.9415e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      697  
   data-arc span      9904 days (27.12 yr)  
   first obs. used      1987-10-25  
   last obs. used      2014-12-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .56059  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jan-08 02:31:25  

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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