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39523 (1989 ST2)
Classification: Main-belt Asteroid          SPK-ID: 2039523
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2393037108644528 6.585e-08  
a 2.326149925825464 1.4285e-08 au
q 1.769493616548359 1.495e-07 au
i 11.59651336189856 4.7264e-06 deg
node 33.36543007161297 2.2674e-05 deg
peri 331.7384210580413 2.4519e-05 deg
M 234.7031694047871 1.4798e-05 deg
tp 2459451.516640367581
(2021-Aug-25.01664037)
5.5968e-05 TDB
period 1295.850739089107
3.55
1.1937e-05
3.268e-08
d
yr
n .2778097732560272 2.5592e-09 deg/d
Q 2.882806235102569 1.7704e-08 au
  Orbit Determination Parameters
   # obs. used (total)      778  
   data-arc span      13595 days (37.22 yr)  
   first obs. used      1982-11-09  
   last obs. used      2020-01-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51602  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 05:28:40  

Additional Information
 Earth MOID = .777977 au 
 Jupiter MOID = 2.5928 au 
 T_jup = 3.509 
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Orbital Elements at Epoch 2456832.5 (2014-Jun-24.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2381249783034149 6.5586e-08  
q 1.77294184138405 1.4862e-07 au
tp 2456857.361383837635
(2014-Jul-18.86138384)
4.3758e-05 TDB
node 33.45824531187391 2.2721e-05 deg
peri 331.3515595064818 2.4582e-05 deg
i 11.58228159944402 4.72e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      778  
   data-arc span      13595 days (37.22 yr)  
   first obs. used      1982-11-09  
   last obs. used      2020-01-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51602  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 05:28:40  

Additional Information
 Jupiter MOID = 2.5928 au 
 T_jup = 3.509 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.301585237379477E-15 -9.724473178832845E-15 1.535396825146751E-12 3.298975879568237E-14 1.271894448669957E-13 1.268043356964821E-15
q -9.724473178832845E-15 2.208763204711921E-14 -3.414273204362361E-12 -7.473472568526776E-14 -2.739981788671288E-13 -3.021931961496377E-15
tp 1.535396825146751E-12 -3.414273204362361E-12 1.914719541356824E-9 1.327723761684829E-11 4.06359709085392E-10 -5.918099777990315E-12
node 3.298975879568237E-14 -7.473472568526776E-14 1.327723761684829E-11 5.162401721705669E-10 -5.034853157386739E-10 -4.384976654230829E-12
peri 1.271894448669957E-13 -2.739981788671288E-13 4.06359709085392E-10 -5.034853157386739E-10 6.042572405461375E-10 2.680792711427481E-12
i 1.268043356964821E-15 -3.021931961496377E-15 -5.918099777990315E-12 -4.384976654230829E-12 2.680792711427481E-12 2.227855407369124E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.3   n/a MPO319561  
diameter diameter 4.723 km 0.165 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.087   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

39523 (1989 ST2)          Discovered 1989-Sep-26 by Elst, E. W. at La Silla
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1989 ST2 = 1982 VS7 = 2000 XL29 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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