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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 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1587871410989821 4.3525e-08  
a 3.16954525486406 2.6558e-08 AU
q 2.666262225260351 1.3912e-07 AU
i 2.34373516625954 5.312e-06 deg
node 120.0345103887047 0.00013939 deg
peri 331.0867075217283 0.00014136 deg
M 44.26963396124965 1.9736e-05 deg
tp 2456747.047083694047
(2014-Mar-30.54708369)
0.00011342 JED
period 2061.075317451468
5.64
2.5905e-05
7.092e-08
d
yr
n .174666106062122 2.1953e-09 deg/d
Q 3.672828284467768 3.0775e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1269  
   data-arc span      14679 days (40.19 yr)  
   first obs. used      1975-01-17  
   last obs. used      2015-03-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50573  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Apr-07 16:34:36  

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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