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145545 Wensayling (2006 KA39)
Classification: Outer Main-belt Asteroid          SPK-ID: 2145545
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet 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. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet is not working, here are some notes that might help.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .165289378053306 4.4477e-08  
a 3.294645446766697 3.468e-08 au
q 2.750075549964473 1.4592e-07 au
i 15.42958323519751 5.759e-06 deg
node 77.99071284349378 1.8009e-05 deg
peri 122.9245749173406 2.4306e-05 deg
M 158.4027865796592 1.7211e-05 deg
tp 2458039.392932848538
(2017-Oct-12.89293285)
0.00010094 TDB
period 2184.295817299445
5.98
3.4488e-05
9.442e-08
d
yr
n .1648128413508964 2.6022e-09 deg/d
Q 3.839215343568922 4.0412e-08 au
  Orbit Determination Parameters
   # obs. used (total)      351  
   data-arc span      7557 days (20.69 yr)  
   first obs. used      1999-02-19  
   last obs. used      2019-10-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60131  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 16:58:46  

Additional Information
 Earth MOID = 1.78059 au 
 Jupiter MOID = 1.33612 au 
 T_jup = 3.092 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457286.5 (2015-Sep-21.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1647173024981655 4.4765e-08  
q 2.753382191677593 1.4719e-07 au
tp 2458043.387774260705
(2017-Oct-16.88777426)
0.0001006 TDB
node 78.04036195878608 1.8033e-05 deg
peri 123.6928449297502 2.4275e-05 deg
i 15.41677665200439 5.7541e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      351  
   data-arc span      7557 days (20.69 yr)  
   first obs. used      1999-02-19  
   last obs. used      2019-10-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60131  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 16:58:46  

Additional Information
 Jupiter MOID = 1.33612 au 
 T_jup = 3.092 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.003882499410204E-15 -6.459635751005057E-15 9.564255354633606E-13 3.590781036908339E-15 1.386146991333588E-13 1.452491884808883E-15
q -6.459635751005057E-15 2.166535696719734E-14 -2.747624950073998E-12 -1.169042573697049E-14 -4.510793010409066E-13 -2.49748200260266E-15
tp 9.564255354633606E-13 -2.747624950073998E-12 1.012022753079511E-8 -7.246901352250008E-12 1.651221891180643E-9 6.181761633592297E-12
node 3.590781036908339E-15 -1.169042573697049E-14 -7.246901352250008E-12 3.251872354643218E-10 -3.144053801310157E-10 -3.336942894251588E-12
peri 1.386146991333588E-13 -4.510793010409066E-13 1.651221891180643E-9 -3.144053801310157E-10 5.892755777140071E-10 3.986146409358024E-12
i 1.452491884808883E-15 -2.49748200260266E-15 6.181761633592297E-12 -3.336942894251588E-12 3.986146409358024E-12 3.310986183801683E-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 14.8   n/a MPO493828  
diameter diameter 5.837 km 1.415 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.062   0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

145545 Wensayling           Discovered 2006 May 22 by Q.-z. Ye and T.-C. Yang at Lulin Observatory.
Sayling Wen (1948-2003), a tireless educator and promoter for social work, was instrumental in in establishing computer networks for "e-learning" at schools in many villages in Taiwan, China and Asia. His humanitarian spirit has also helped shape university education in Asia.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20080520/MPCPages.arcLast Updated: 2008-05-22

Alternate Designations
 2006 KA39 = 2003 YR123 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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