Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
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 ]  
173118 (1981 EB4)
Classification: Main-belt Asteroid          SPK-ID: 2173118
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08805753197377426 6.1059e-08  
a 3.130689784584318 3.0277e-08 au
q 2.855008968778316 1.9296e-07 au
i 8.482165390621189 5.6359e-06 deg
node 305.5066028438075 4.0096e-05 deg
peri 266.2640819005795 5.1738e-05 deg
M 4.800578280891889 3.3067e-05 deg
tp 2458973.519528419080
(2020-May-04.01952842)
0.0001859 TDB
period 2023.291612136057
5.54
2.9351e-05
8.036e-08
d
yr
n .1779278863415718 2.5811e-09 deg/d
Q 3.40637060039032 3.2943e-08 au
  Orbit Determination Parameters
   # obs. used (total)      336  
   data-arc span      14330 days (39.23 yr)  
   first obs. used      1981-02-02  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60863  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-21 03:24:31  

Additional Information
 Earth MOID = 1.86599 au 
 Jupiter MOID = 1.69627 au 
 T_jup = 3.190 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.3   n/a MPO433111  

173118 (1981 EB4)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20080122/Numbers.arcLast Updated: 2008-01-28

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Aug-09 21:41 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin