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 ]  
13959 (1991 EL4)
Classification: Main-belt Asteroid          SPK-ID: 2013959
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1691466643009984 4.2456e-08  
a 2.671035002761437 1.4817e-08 au
q 2.219238341813131 1.1153e-07 au
i 12.83980692475478 5.6438e-06 deg
node 181.4195483296752 1.9999e-05 deg
peri 85.99502668811576 2.7064e-05 deg
M 217.6191319693971 1.9058e-05 deg
tp 2458231.118825511463
(2018-Apr-22.61882551)
8.6678e-05 JED
period 1594.475299415447
4.37
1.3268e-05
3.633e-08
d
yr
n .225779602940215 1.8787e-09 deg/d
Q 3.122831663709742 1.7323e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1284  
   data-arc span      9098 days (24.91 yr)  
   first obs. used      1991-03-12  
   last obs. used      2016-02-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50288  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Feb-25 18:57:41  

Additional Information
 Earth MOID = 1.24885 au 
 Jupiter MOID = 2.07986 au 
 T_jup = 3.325 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.2 mag n/a MPO358766  
rotation period rot_per 3.1243 h n/a LCDB (Rev. 2016-February); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2016) Astron. J. 150, A75.]

13959 (1991 EL4)          Discovered 1991-Mar-12 by Debehogne, H. at La Silla
Reference: 20000320/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 EL4 = 1992 PA3 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2016-May-01 02:20 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin