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11897 Lemaire (1991 GC7)
Classification: Main-belt Asteroid          SPK-ID: 2011897
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1088313505004508 3.6492e-08  
a 2.266531563696753 6.6326e-09 au
q 2.019861872667737 8.3678e-08 au
i 5.178445336017609 4.2857e-06 deg
node 28.22382482082615 3.7614e-05 deg
peri 138.3968141074533 4.1688e-05 deg
M 280.780158156274 1.7598e-05 deg
tp 2459474.766367299888
(2021-Sep-17.26636730)
6.1168e-05 TDB
period 1246.353059158238
3.41
5.4708e-06
1.498e-08
d
yr
n .2888427138319354 1.2679e-09 deg/d
Q 2.513201254725769 7.3544e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1767  
   data-arc span      24808 days (67.92 yr)  
   first obs. used      1953-02-15  
   last obs. used      2021-01-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47895  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:02:58  

Additional Information
 Earth MOID = 1.02902 au 
 Jupiter MOID = 2.45511 au 
 T_jup = 3.603 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.75   n/a E2021B10  
diameter diameter 3.550 km 0.867 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
geometric albedo albedo 0.203   0.128 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

11897 Lemaire           Discovered 1991 Apr. 8 by E. W. Elst at the European Southern Observatory.
Joseph F. Lemaire (b. 1939), head of the Fundamental Dynamics section at the Belgian Institute for Space Aeronomy, Uccle, is renowned for his research on radiation belts, the solar wind and planetary magnetic fields. With Konstantin Gringauz he published the book The Earth's Plasmasphere in 1998.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010509/MPCPages.arcLast Updated: 2009-05-11

Alternate Designations
 1991 GC7 = 1977 CZ2 = 1984 DR2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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