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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1681799513817712 3.0744e-08  
a 2.672708530009513 1.0637e-08 au
q 2.223212539374868 8.1063e-08 au
i 12.83265523339258 4.0547e-06 deg
node 181.3921724670957 1.473e-05 deg
peri 85.87750028706365 1.9379e-05 deg
M 173.6337906602656 1.4461e-05 deg
tp 2458230.736042657367
(2018-Apr-22.23604266)
6.196e-05 TDB
period 1595.974053147034
4.37
9.5275e-06
2.608e-08
d
yr
n .2255675769227772 1.3466e-09 deg/d
Q 3.122204520644158 1.2426e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2128  
   data-arc span      10551 days (28.89 yr)  
   first obs. used      1991-03-12  
   last obs. used      2020-01-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47699  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 20:48:30  

Additional Information
 Earth MOID = 1.25286 au 
 Jupiter MOID = 2.08197 au 
 T_jup = 3.325 
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Orbital Elements at Epoch 2456803.5 (2014-May-26.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1689481194350651 3.061e-08  
q 2.220725439087843 8.0706e-08 au
tp 2456637.211213606063
(2013-Dec-10.71121361)
5.8407e-05 TDB
node 181.4179674254564 1.4721e-05 deg
peri 86.17387595248383 1.9366e-05 deg
i 12.83761576817752 4.0565e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2128  
   data-arc span      10551 days (28.89 yr)  
   first obs. used      1991-03-12  
   last obs. used      2020-01-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47699  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 20:48:30  

Additional Information
 Jupiter MOID = 2.08197 au 
 T_jup = 3.325 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.369856078297587E-16 -2.456113937959126E-15 1.741732726426168E-13 -2.713108300568321E-15 1.29010028109369E-14 6.778659416738295E-16
q -2.456113937959126E-15 6.51350864739911E-15 -3.166992485374683E-13 6.991113218125958E-15 -3.303968612212581E-15 -1.81965888171566E-15
tp 1.741732726426168E-13 -3.166992485374683E-13 3.411334925782571E-9 -2.860481147250004E-12 7.437803223842397E-10 -3.713199441087965E-12
node -2.713108300568321E-15 6.991113218125958E-15 -2.860481147250004E-12 2.167010544901952E-10 -2.11532429516673E-10 5.282538153233926E-12
peri 1.29010028109369E-14 -3.303968612212581E-15 7.437803223842397E-10 -2.11532429516673E-10 3.750274399355301E-10 -5.949019856904603E-12
i 6.778659416738295E-16 -1.81965888171566E-15 -3.713199441087965E-12 5.282538153233926E-12 -5.949019856904603E-12 1.645505603669621E-11

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 13.2   n/a MPO502275  
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. 2019-August); 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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