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JPL Small-Body Database Browser
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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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1681800176475618 3.077e-08  
a 2.672708529862205 1.0664e-08 au
q 2.22321236214319 8.1161e-08 au
i 12.83265743773699 4.1583e-06 deg
node 181.3921678193598 1.4791e-05 deg
peri 85.87749923391866 1.9535e-05 deg
M 173.6337909611317 1.453e-05 deg
tp 2458230.736041387188
(2018-Apr-22.23604139)
6.2324e-05 TDB
period 1595.974053015089
4.37
9.5518e-06
2.615e-08
d
yr
n .2255675769414256 1.35e-09 deg/d
Q 3.122204697581219 1.2457e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2050  
   data-arc span      10497 days (28.74 yr)  
   first obs. used      1991-03-12  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48337  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 23:40:31  

Additional Information
 Earth MOID = 1.25286 au 
 Jupiter MOID = 2.08197 au 
 T_jup = 3.325 
[ 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 13.2   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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2071-Apr-10 08:47 < 00:01 Eunom 0.0381285646657473 0.0381212490418575 0.0381358818612113 9.04700478287194 9.04700474217717 2477576.865886567 0.609320696685615 532.263568288706 34.1075100341662 46.8660441897744 122232.024154621 T 32 CATAB v2.0f-lin.ifort 2019-Dec-13 23:40:48 2019-Dec-13 23:40

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