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JPL Small-Body Database Browser
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39505 (1981 EX40)
Classification: Main-belt Asteroid          SPK-ID: 2039505
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0295394185003005 4.2622e-08  
a 3.002866331952656 2.3114e-08 au
q 2.914163406672644 1.2954e-07 au
i 10.52699388063577 9.2001e-06 deg
node 349.3809561924276 2.679e-05 deg
peri 53.72949442152444 0.00016339 deg
M 324.0594698397745 0.0001621 deg
tp 2459190.251145444338
(2020-Dec-06.75114544)
0.00085616 TDB
period 1900.651216201567
5.20
2.1945e-05
6.008e-08
d
yr
n .189408765233348 2.1869e-09 deg/d
Q 3.091569257232667 2.3797e-08 au
  Orbit Determination Parameters
   # obs. used (total)      725  
   data-arc span      14145 days (38.73 yr)  
   first obs. used      1981-02-09  
   last obs. used      2019-11-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5879  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-04 02:31:42  

Additional Information
 Earth MOID = 1.93005 au 
 Jupiter MOID = 2.026 au 
 T_jup = 3.226 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.5   n/a MPO436047  

39505 (1981 EX40)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 EX40 = 1999 TS219 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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