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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 4 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1424909874999144 6.9315e-08  
a 2.676269653753532 1.9188e-08 AU
q 2.294925347974137 1.8345e-07 AU
i 11.08292483061064 8.306e-06 deg
node 320.5520207313508 3.05e-05 deg
peri 155.5695742570586 3.972e-05 deg
M 248.2085259017517 2.681e-05 deg
tp 2457297.091650743627
(2015-Oct-01.59165074)
0.00012178 JED
period 1599.164835330738
4.38
1.7198e-05
4.709e-08
d
yr
n .225117506367344 2.4211e-09 deg/d
Q 3.057613959532926 2.1922e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      768  
   data-arc span      21311 days (58.35 yr)  
   first obs. used      1955-03-24  
   last obs. used      2013-07-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54123  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Aug-26 19:04:53  

Additional Information
 Earth MOID = 1.31529 AU 
 T_jup = 3.337 
[ 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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