Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 
[ 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 34 CATAB v2.0f-lin.ifort 2020-Nov-13 02:43:05 2020-Nov-13 02:43

Alternate Designations
 1991 EL4 = 1992 PA3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Nov-24 20:21 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin