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2945 Zanstra (1935 ST1)
Classification: Main-belt Asteroid          SPK-ID: 2002945
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 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1386728833070958 3.6265e-08  
a 2.669443922888943 1.0061e-08 au
q 2.299264437275329 9.5419e-08 au
i 2.624639399591517 3.7014e-06 deg
node 95.7759406187795 8.0241e-05 deg
peri 244.0782753907735 8.137e-05 deg
M 175.6936381411282 1.4695e-05 deg
tp 2458223.030850090041
6.4075e-05 TDB
period 1593.050818053871
n .225981491563332 1.2776e-09 deg/d
Q 3.039623408502558 1.1456e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2755  
   data-arc span      30947 days (84.73 yr)  
   first obs. used      1935-09-28  
   last obs. used      2020-06-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4503  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:04:35  

Additional Information
 Earth MOID = 1.29196 au 
 Jupiter MOID = 2.33539 au 
 T_jup = 3.366 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.7   n/a MPO502181  
diameter diameter 23.701 km 0.336 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 10.05 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Behrend, R. (2001) Observatoire de Geneve web site,]
geometric albedo albedo 0.031   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

2945 Zanstra (1935 ST1)          Discovered 1935-Sep-28 by Van Gent, H. at Johannesburg (LS)
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1935 ST1 = 1957 UC1 = 1970 SY = 1970 WM = 1975 XY5 = 1983 TN 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2020-Dec-01 12:57 UT
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