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

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Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1691086359698753 4.2459e-08  
a 2.671053283416603 1.4912e-08 au
q 2.219355106055164 1.1145e-07 au
i 12.83979094236666 5.7307e-06 deg
node 181.4202574525033 2e-05 deg
peri 86.02762960563861 2.7237e-05 deg
M 172.4167693455443 1.905e-05 deg
tp 2456636.841382734860
(2013-Dec-10.34138273)
8.2195e-05 JED
period 1594.491668408905
4.37
1.3353e-05
3.656e-08
d
yr
n .2257772850950253 1.8908e-09 deg/d
Q 3.122751460778041 1.7434e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1256  
   data-arc span      9047 days (24.77 yr)  
   first obs. used      1991-03-12  
   last obs. used      2015-12-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50185  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 13:25:58  

Additional Information
 Earth MOID = 1.24784 au 
 Jupiter MOID = 2.07915 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. 2015-December); 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. (2015) 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 ]
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