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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1587871498361531 4.2712e-08  
a 3.169545250152715 2.6178e-08 AU
q 2.666262193604248 1.3578e-07 AU
i 2.343737443248383 5.2193e-06 deg
node 120.0344797552962 0.00013878 deg
peri 331.0867409150827 0.00014075 deg
M 44.26963273468741 1.9723e-05 deg
tp 2456747.047091281487
(2014-Mar-30.54709128)
0.00011333 JED
period 2061.075312855965
5.64
2.5534e-05
6.991e-08
d
yr
n .1746661064515686 2.1639e-09 deg/d
Q 3.672828306701181 3.0334e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1306  
   data-arc span      14762 days (40.42 yr)  
   first obs. used      1975-01-17  
   last obs. used      2015-06-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50919  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 12:01:44  

Additional Information
 Earth MOID = 1.68291 AU 
 T_jup = 3.182 
[ 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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