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

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1680361403630761 1.9396e-08  
a 2.672985445530887 9.7601e-09 au
q 2.2238272880172 5.1184e-08 au
i 12.83287682381956 3.6796e-07 deg
node 181.3822497202182 2.5295e-06 deg
peri 85.91625965630898 5.1658e-06 deg
M 218.6995258722812 7.6629e-06 deg
tp 2459827.019274336985
(2022-Sep-04.51927434)
3.6324e-05 TDB
period 1596.222094466908
4.37
8.7427e-06
2.394e-08
d
yr
n .2255325253596552 1.2353e-09 deg/d
Q 3.122143603044575 1.14e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2558  
   data-arc span      10960 days (30.01 yr)  
   first obs. used      1991-03-12  
   last obs. used      2021-03-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45441  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 00:13:58  

Additional Information
 Earth MOID = 1.25185 au 
 Jupiter MOID = 2.08104 au 
 T_jup = 3.324 
[ 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 13.18   n/a E2021B10  
diameter diameter 6.489 km 0.266 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.124 h n/a LCDB (Rev. 2020-October); 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.]
geometric albedo albedo 0.290   0.048 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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

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Alternate Designations
 1991 EL4 = 1992 PA3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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