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11498 Julgeerts (1989 GS4)
Classification: Main-belt Asteroid          SPK-ID: 2011498
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1499363672683859 3.2002e-08  
a 2.758290878410175 1.4569e-08 au
q 2.344722764231828 8.8658e-08 au
i 2.351264167549995 4.135e-06 deg
node 175.7876953006632 8.5967e-05 deg
peri 97.19297520301582 8.7716e-05 deg
M 233.1583948739449 2.1721e-05 deg
tp 2459590.046072038419
(2022-Jan-10.54607204)
0.0001038 TDB
period 1673.241092486258
4.58
1.3257e-05
3.63e-08
d
yr
n .2151513022340841 1.7047e-09 deg/d
Q 3.171858992588521 1.6754e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1734  
   data-arc span      11366 days (31.12 yr)  
   first obs. used      1989-04-03  
   last obs. used      2020-05-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52526  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:59:11  

Additional Information
 Earth MOID = 1.32991 au 
 Jupiter MOID = 1.93512 au 
 T_jup = 3.325 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.0   n/a MPO458939  
diameter diameter 5.882 km 0.279 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.154   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

11498 Julgeerts           Discovered 1989 Apr. 3 by E. W. Elst at the European Southern Observatory.
Julien Armand Geerts (b. 1909) is a well-known commercial artist in Belgium. He was for many years a good friend of the discoverer's parents. The naming is on the occasion of Geerts' ninetieth birthday.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19991123/MPCPages.arcLast Updated: 2010-06-11

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Alternate Designations
 1989 GS4 = 1990 RX6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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