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 ]  
9857 (1991 EN)
Classification: Jupiter Trojan          SPK-ID: 2009857
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 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02549073998023522 9.8016e-08  
a 5.144900340775246 1.7762e-07 AU
q 5.013753023964321 5.9859e-07 AU
i 19.6203445909228 9.7751e-06 deg
node 289.3949278990103 2.3406e-05 deg
peri 2.680853077384379 0.00016543 deg
M 269.4417581618187 0.00016674 deg
tp 2458072.733466685365
(2017-Nov-15.23346669)
0.0019925 JED
period 4262.494944374946
11.67
0.00022074
6.044e-07
d
yr
n .08445757817849811 4.3737e-09 deg/d
Q 5.276047657586172 1.8215e-07 AU
  Orbit Determination Parameters
   # obs. used (total)      713  
   data-arc span      8844 days (24.21 yr)  
   first obs. used      1991-03-06  
   last obs. used      2015-05-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .48903  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 16:06:47  

Additional Information
 Earth MOID = 3.99882 AU 
 T_jup = 2.884 
[ 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 10.2 mag n/a MPO263437  

9857 (1991 EN)          Discovered 1991-Mar-10 by McNaught, R. H. at Siding Spring
Reference: 19990106/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1991 EN = 1994 NH1 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2015-Jul-01 01:53 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin