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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1681799509961666 3.0625e-08  
a 2.672708530489739 1.0598e-08 au
q 2.223212540804938 8.0774e-08 au
i 12.83265535354003 3.9752e-06 deg
node 181.3921722291742 1.4702e-05 deg
peri 85.87749935669454 1.9286e-05 deg
M 173.6337914938817 1.442e-05 deg
tp 2458230.736038754265
(2018-Apr-22.23603875)
6.1741e-05 TDB
period 1595.974053577176
4.37
9.493e-06
2.599e-08
d
yr
n .2255675768619829 1.3417e-09 deg/d
Q 3.122204520174539 1.2381e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2212  
   data-arc span      10825 days (29.64 yr)  
   first obs. used      1991-03-12  
   last obs. used      2020-10-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47566  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:43:00  

Additional Information
 Earth MOID = 1.25286 au 
 Jupiter MOID = 2.08197 au 
 T_jup = 3.325 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456881.5 (2014-Aug-12.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1689369906686229 3.0491e-08  
q 2.22064232928805 8.0419e-08 au
tp 2456637.159468393930
(2013-Dec-10.65946839)
5.8105e-05 TDB
node 181.4168966258553 1.4692e-05 deg
peri 86.15770430187877 1.9273e-05 deg
i 12.83802321519286 3.977e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2212  
   data-arc span      10825 days (29.64 yr)  
   first obs. used      1991-03-12  
   last obs. used      2020-10-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47566  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:43:00  

Additional Information
 Jupiter MOID = 2.08197 au 
 T_jup = 3.325 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.297110961835531E-16 -2.43785152943513E-15 1.781239748338217E-13 -2.707010029999563E-15 1.427261611613541E-14 6.865596404445598E-16
q -2.43785152943513E-15 6.467266108586572E-15 -3.227013174981982E-13 6.96821826524717E-15 -5.688631304964897E-15 -1.833031350117367E-15
tp 1.781239748338217E-13 -3.227013174981982E-13 3.376229565581307E-9 -2.798641195687103E-12 7.339276044210769E-10 -3.565650772094268E-12
node -2.707010029999563E-15 6.96821826524717E-15 -2.798641195687103E-12 2.158533982542814E-10 -2.106931440923549E-10 5.390532133700404E-12
peri 1.427261611613541E-14 -5.688631304964897E-15 7.339276044210769E-10 -2.106931440923549E-10 3.714499902427671E-10 -6.021523104498519E-12
i 6.865596404445598E-16 -1.833031350117367E-15 -3.565650772094268E-12 5.390532133700404E-12 -6.021523104498519E-12 1.581680469471621E-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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