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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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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1499363668513351 3.1997e-08  
a 2.758290878133597 1.4563e-08 au
q 2.344722765147067 8.8648e-08 au
i 2.35126416733743 4.135e-06 deg
node 175.7876953142012 8.5949e-05 deg
peri 97.19297497610003 8.7698e-05 deg
M 233.1583952161555 2.1715e-05 deg
tp 2459590.046070359190
(2022-Jan-10.54607036)
0.00010377 TDB
period 1673.241092234591
4.58
1.3251e-05
3.628e-08
d
yr
n .2151513022664444 1.7039e-09 deg/d
Q 3.171858991120127 1.6746e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1738  
   data-arc span      11546 days (31.61 yr)  
   first obs. used      1989-04-03  
   last obs. used      2020-11-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52479  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 20:16:27  

Additional Information
 Earth MOID = 1.32991 au 
 Jupiter MOID = 1.93512 au 
 T_jup = 3.325 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456687.5 (2014-Jan-30.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1522693239278425 3.2053e-08  
q 2.336217618814931 8.8921e-08 au
tp 2456243.330762365045
(2012-Nov-11.83076236)
8.8224e-05 TDB
node 175.871625010728 8.6166e-05 deg
peri 96.91357431025989 8.7857e-05 deg
i 2.347582489973327 4.135e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1738  
   data-arc span      11546 days (31.61 yr)  
   first obs. used      1989-04-03  
   last obs. used      2020-11-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52479  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 20:16:27  

Additional Information
 Jupiter MOID = 1.93512 au 
 T_jup = 3.325 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.027397757745247E-15 -2.823345968339027E-15 1.012749860472978E-13 6.761944034944369E-16 3.827470933937343E-14 3.311206727672344E-16
q -2.823345968339027E-15 7.907004717956693E-15 1.724215457428127E-13 3.805449788058725E-16 -1.429297632505273E-14 -7.766796247429901E-16
tp 1.012749860472978E-13 1.724215457428127E-13 7.78347611169631E-9 2.215358749714144E-11 1.52660746204258E-9 6.36885973157237E-13
node 6.761944034944369E-16 3.805449788058725E-16 2.215358749714144E-11 7.424636215595954E-9 -7.41373774903098E-9 -4.021132065681143E-11
peri 3.827470933937343E-14 -1.429297632505273E-14 1.52660746204258E-9 -7.41373774903098E-9 7.718865248018924E-9 4.031192785449506E-11
i 3.311206727672344E-16 -7.766796247429901E-16 6.36885973157237E-13 -4.021132065681143E-11 4.031192785449506E-11 1.709800923555763E-11

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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