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13538 (1991 ST)
Classification: Main-belt Asteroid          SPK-ID: 2013538
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2203741453324 2.7495e-08  
a 2.20063588384472 5.4932e-09 au
q 1.715672631754629 6.2689e-08 au
i 6.849866402562202 3.1036e-06 deg
node 79.51621098885261 2.4007e-05 deg
peri 229.3472283432902 2.5025e-05 deg
M 309.7326550763782 7.675e-06 deg
tp 2459166.996135784345
(2020-Nov-13.49613578)
2.563e-05 TDB
period 1192.396554332385
3.26
4.4646e-06
1.222e-08
d
yr
n .3019129824654363 1.1304e-09 deg/d
Q 2.685599135934811 6.7037e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2773  
   data-arc span      24735 days (67.72 yr)  
   first obs. used      1952-11-12  
   last obs. used      2020-08-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45939  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 00:44:34  

Additional Information
 Earth MOID = .710239 au 
 Jupiter MOID = 2.58379 au 
 T_jup = 3.624 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457054.5 (2015-Feb-01.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2208575706019365 2.7561e-08  
q 1.714331380553493 6.2851e-08 au
tp 2456781.379475066044
(2014-May-03.87947507)
2.3855e-05 TDB
node 79.5915038155797 2.4003e-05 deg
peri 229.1312802170766 2.501e-05 deg
i 6.85111942468146 3.1039e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2773  
   data-arc span      24735 days (67.72 yr)  
   first obs. used      1952-11-12  
   last obs. used      2020-08-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45939  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 00:44:34  

Additional Information
 Jupiter MOID = 2.58379 au 
 T_jup = 3.624 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.595966881939528E-16 -1.729125249260179E-15 -2.727926590218511E-14 3.629807506310983E-16 -7.568238779831494E-15 -5.752899697346597E-16
q -1.729125249260179E-15 3.950292990434596E-15 6.009749959411262E-14 -8.362938933246892E-16 1.780163993469722E-14 1.393201489441116E-15
tp -2.727926590218511E-14 6.009749959411262E-14 5.69041843391408E-10 4.709042598865196E-14 1.742110606196753E-10 -2.089590058991571E-13
node 3.629807506310983E-16 -8.362938933246892E-16 4.709042598865196E-14 5.76157970889597E-10 -5.716741469886474E-10 -6.127849544770645E-12
peri -7.568238779831494E-15 1.780163993469722E-14 1.742110606196753E-10 -5.716741469886474E-10 6.25502548716118E-10 6.028775875658286E-12
i -5.752899697346597E-16 1.393201489441116E-15 -2.089590058991571E-13 -6.127849544770645E-12 6.028775875658286E-12 9.634166894011204E-12

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.7   n/a MPO381372  
diameter diameter 4.762 km 0.081 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 12.3206 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Ditteon, R.; Trent, L. (2018) Minor Planet Bull. 45, 328-329.]
[Radford, D. (2018) Minor Planet Bull. 45, 2.]
geometric albedo albedo 0.340   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

13538 (1991 ST)          Discovered 1991-Sep-30 by McNaught, R. H. at Siding Spring
Reference: 20000222/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1991 ST = 1952 VD = 1978 SB1 = 1978 TL9 = 1994 LF8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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