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7157 Lofgren (1981 EC8)
Classification: Main-belt Asteroid          SPK-ID: 2007157
[ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

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Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB
Reference: JPL 1 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2273214441621886 5.7288e-08  
a 2.199334153040817 1.3362e-08 AU
q 1.699378337176355 1.277e-07 AU
i 4.138972234799293 6.5186e-06 deg
node 237.6469694772963 8.5016e-05 deg
peri 100.1256990399957 8.6223e-05 deg
M 148.0050598171898 1.5769e-05 deg
tp 2455910.710673862781
(2011-Dec-15.21067386)		 5.0448e-05 JED
period 1191.338712522315
3.26		 1.0857e-05
2.972e-08		 d
yr
n .3021810642229567 2.7539e-09 deg/d
Q 2.699289968905279 1.64e-08 AU
   Orbit Determination Parameters
   # obs. used (total)      904  
   data-arc span      11759 days (32.19 yr)  
   first obs. used      1981-02-09  
   last obs. used      2013-04-21  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   condition code      0  
   fit RMS      .53476  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Apr-29 13:25:09  

Additional Information
 Earth MOID = .696193 AU 
 T_jup = 3.629 
[ 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 14.6 mag n/a PDS3 (MPC 27894)  

7157 Lofgren           Discovered 1981 Mar. 1 by S. J. Bus at Siding Spring in the course of the U.K. Schmidt-Caltech Asteroid Survey.
Gary E. Lofgren (b. 1941) is a planetary scientist and curator of lunar materials at NASA's Johnson Space Center. His pioneering work in experimental petrology provides clues to the formation of igneous rocks on the earth, moon and minor planets.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060809/MPCPages.arcLast Updated: 2007-08-08

Alternate Designations
 1981 EC8 = 1989 YQ8 = 1992 WO2 
[ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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