Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Near-Earth Object (NEO) Program
Search JPL
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1613071089687424 9.0835e-08  
a 2.687101662382463 2.7868e-08 AU
q 2.253653061718446 2.5252e-07 AU
i 12.77707947149273 8.5614e-06 deg
node 228.1208979122438 3.1867e-05 deg
peri 170.7172260319535 3.8867e-05 deg
M 54.24024077149217 2.4404e-05 deg
tp 2456758.093823629932
(2014-Apr-10.59382363)
0.00010772 JED
period 1608.883409291394
4.40
2.5029e-05
6.853e-08
d
yr
n .2237576681572943 3.4809e-09 deg/d
Q 3.12055026304648 3.2364e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      669  
   data-arc span      9839 days (26.94 yr)  
   first obs. used      1987-10-25  
   last obs. used      2014-10-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .57062  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Oct-09 14:32:30  

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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2014-Oct-23 11:46 UT
(server date/time)  
NASA Home Page
Site Manager:   Donald K. Yeomans
Webmaster  Alan B. Chamberlin