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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09804584143166414 7.0321e-08  
a 2.47588231849308 1.265e-08 au
q 2.233132353290646 1.6904e-07 au
i 5.353795362129654 3.1063e-06 deg
node 258.4183534522396 6.0195e-05 deg
peri 264.3784178387613 6.4571e-05 deg
M 35.36431883494125 2.2986e-05 deg
tp 2458860.716400049882
(2020-Jan-12.21640005)
9.0442e-05 TDB
period 1422.962399386653
3.90
1.0906e-05
2.986e-08
d
yr
n .2529933328914191 1.939e-09 deg/d
Q 2.718632283695513 1.3891e-08 au
  Orbit Determination Parameters
   # obs. used (total)      653  
   data-arc span      14321 days (39.21 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-04-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52394  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 22:39:18  

Additional Information
 Earth MOID = 1.24871 au 
 Jupiter MOID = 2.29222 au 
 T_jup = 3.469 
[ 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-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.]

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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