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9278 (1981 EM1)
Classification: Main-belt Asteroid          SPK-ID: 2009278
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1587229598944645 4.1889e-08  
a 3.165579087676809 2.512e-08 au
q 2.663129005100727 1.3198e-07 au
i 2.343789887560217 5.1637e-06 deg
node 120.0319939431678 0.00013721 deg
peri 330.6078435061464 0.00013915 deg
M 149.6932802206663 1.9552e-05 deg
tp 2456745.082789746865
(2014-Mar-28.58278975)
0.00011239 JED
period 2057.207880254692
5.63
2.4487e-05
6.704e-08
d
yr
n .1749944686948362 2.0829e-09 deg/d
Q 3.66802917025289 2.9107e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1331  
   data-arc span      15020 days (41.12 yr)  
   first obs. used      1975-01-17  
   last obs. used      2016-03-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50888  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Mar-24 16:02:54  

Additional Information
 Earth MOID = 1.67839 au 
 Jupiter MOID = 1.53967 au 
 T_jup = 3.183 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.9 mag n/a MPO279613  

9278 (1981 EM1)          Discovered 1981-Mar-07 by Debehogne, H., DeSanctis, G. at La Silla
Reference: 19981005/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EM1 = 1975 BK = 1982 JQ1 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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