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7156 (1981 EC2)
Classification: Main-belt Asteroid          SPK-ID: 2007156
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1425388790547427 5.7889e-08  
a 2.675825992767932 2.1841e-08 AU
q 2.294416755213247 1.5396e-07 AU
i 11.08309797610619 7.1687e-06 deg
node 320.5526337361188 2.8617e-05 deg
peri 155.6352605764375 3.7638e-05 deg
M 293.17372402449 2.5982e-05 deg
tp 2457297.276827640686
(2015-Oct-01.77682764)
0.00011733 JED
period 1598.767197349149
4.38
1.9575e-05
5.359e-08
d
yr
n .2251734965521568 2.7569e-09 deg/d
Q 3.057235230322617 2.4955e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      823  
   data-arc span      21769 days (59.60 yr)  
   first obs. used      1955-03-24  
   last obs. used      2014-10-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49709  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Nov-10 13:03:37  

Additional Information
 Earth MOID = 1.31499 AU 
 T_jup = 3.338 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.4 mag n/a MPO267736  

7156 (1981 EC2)          Discovered 1981-Mar-04 by Debehogne, H., DeSanctis, G. at La Silla (809)
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1981 EC2 = 1975 XX6 = 1994 BQ4 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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