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136578 (1981 EL45)
Classification: Main-belt Asteroid          SPK-ID: 2136578
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09831620062483835 7.3052e-08  
a 2.476522725596729 1.482e-08 au
q 2.233040420454989 1.7807e-07 au
i 5.353872190371249 3.5077e-06 deg
node 258.4196322578582 6.1775e-05 deg
peri 264.3466248191905 6.5954e-05 deg
M 294.2200555429695 2.3344e-05 deg
tp 2458860.607517980377
(2020-Jan-12.10751798)
9.3324e-05 TDB
period 1423.514526287011
3.90
1.2778e-05
3.498e-08
d
yr
n .252895206443026 2.27e-09 deg/d
Q 2.720005030738468 1.6277e-08 au
  Orbit Determination Parameters
   # obs. used (total)      542  
   data-arc span      13825 days (37.85 yr)  
   first obs. used      1981-02-09  
   last obs. used      2018-12-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55979  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 04:51:53  

Additional Information
 Earth MOID = 1.2491 au 
 Jupiter MOID = 2.2924 au 
 T_jup = 3.468 
[ 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 16.0   n/a MPO422494  
rotation period rot_per 5.223 h n/a LCDB (Rev. 2019-January); 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.]

136578 (1981 EL45)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20061205/Numbers.arcLast Updated: 2006-12-13

[ show close-approach data ]
Alternate Designations
 1981 EL45 = 2002 RB203 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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