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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1429701940634724 5.5457e-08  
a 2.676922930975226 1.9528e-08 au
q 2.294202740040739 1.485e-07 au
i 11.08188599702606 6.8741e-06 deg
node 320.5535674728234 2.8009e-05 deg
peri 155.6613514696314 3.6791e-05 deg
M 23.21088225378656 2.4865e-05 deg
tp 2457297.356615866950
(2015-Oct-01.85661587)
0.00010997 JED
period 1599.750405085978
4.38
1.7505e-05
4.793e-08
d
yr
n .2250351047610154 2.4624e-09 deg/d
Q 3.059643121909714 2.232e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1003  
   data-arc span      22184 days (60.74 yr)  
   first obs. used      1955-03-24  
   last obs. used      2015-12-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49383  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 13:02:50  

Additional Information
 Earth MOID = 1.31465 au 
 Jupiter MOID = 2.03542 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 13.5 mag n/a MPO319174  

7156 (1981 EC2)          Discovered 1981-Mar-04 by Debehogne, H., DeSanctis, G. at La Silla
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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