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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 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1425388652856284 6.0476e-08  
a 2.675825987519743 2.2829e-08 AU
q 2.294416787556882 1.5936e-07 AU
i 11.08309874516965 7.4028e-06 deg
node 320.5526326313725 2.8692e-05 deg
peri 155.635259549766 3.7759e-05 deg
M 293.1737281566927 2.6482e-05 deg
tp 2457297.276808416373
(2015-Oct-01.77680842)
0.00011972 JED
period 1598.767192645573
4.38
2.046e-05
5.602e-08
d
yr
n .2251734972146176 2.8816e-09 deg/d
Q 3.057235187482602 2.6083e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      797  
   data-arc span      21742 days (59.53 yr)  
   first obs. used      1955-03-24  
   last obs. used      2014-10-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .4991  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Oct-09 14:09:11  

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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