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 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02549071202749681 1.1394e-07  
a 5.144900302695264 1.9743e-07 AU
q 5.013753130669079 6.3604e-07 AU
i 19.62034792258985 1.2296e-05 deg
node 289.3949311912072 2.4219e-05 deg
peri 2.68081725830234 0.00018042 deg
M 269.4417941920482 0.00018439 deg
tp 2458072.733028173746
(2017-Nov-15.23302817)
0.0022113 JED
period 4262.494897051659
11.67
0.00024535
6.717e-07
d
yr
n .08445757911616733 4.8614e-09 deg/d
Q 5.27604747472145 2.0246e-07 AU
  Orbit Determination Parameters
   # obs. used (total)      686  
   data-arc span      8693 days (23.80 yr)  
   first obs. used      1991-03-06  
   last obs. used      2014-12-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .48225  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jan-08 00:31:33  

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 (413)
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-Jan-26 08:27 UT
(server date/time)  
NASA Home Page
Site Manager:   Donald K. Yeomans
Webmaster  Alan B. Chamberlin