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65653 (1981 EP44)
Classification: Main-belt Asteroid          SPK-ID: 2065653
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1124204012389392 4.0401e-08  
a 2.314984251753175 8.8826e-09 au
q 2.054732793309258 9.4577e-08 au
i 5.951478187538507 4.2751e-06 deg
node 178.7181892104142 3.6313e-05 deg
peri 63.21807363305877 4.1638e-05 deg
M 350.4254384547974 1.8229e-05 deg
tp 2459034.716602353529
(2020-Jul-04.21660235)
6.5101e-05 TDB
period 1286.531690157899
3.52
7.4046e-06
2.027e-08
d
yr
n .2798221005778851 1.6105e-09 deg/d
Q 2.575235710197092 9.8812e-09 au
  Orbit Determination Parameters
   # obs. used (total)      605  
   data-arc span      14429 days (39.50 yr)  
   first obs. used      1981-03-07  
   last obs. used      2020-09-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53405  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 22:21:18  

Additional Information
 Earth MOID = 1.0507 au 
 Jupiter MOID = 2.43328 au 
 T_jup = 3.566 
[ 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 16.4   n/a MPO422120  

65653 (1981 EP44)          Discovered 1981-Mar-07 by Bus, S. J. at Siding Spring
Reference: 20030910/Numbers.arcLast Updated: 2004-04-19

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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
1917-Mar-28 13:27 < 00:01 Hebe 0.0384164781605358 0.0384017765580364 0.0384311797647666 6.48533853540253 6.48533851045042 2421316.060525890 0.677475716000527 733.018635220284 59.4903043790515 0.94095035601041 7995.83010027921 T 19 CATAB v2.0f-lin.ifort 2020-Nov-12 22:21:19 2020-Nov-12 22:21
2008-Jun-21 12:07 < 00:01 David 0.0382790444980473 0.0382781523052198 0.0382799367228655 5.64024481939217 5.64024474942022 2454639.004895307 0.596181112623905 98.2969700159702 34.5640483758028 -72.2961661445123 158747.880707242 T 19 CATAB v2.0f-lin.ifort 2020-Nov-12 22:21:19 2020-Nov-12 22:21

Alternate Designations
 1981 EP44 = 1999 LM9 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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