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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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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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1386728833603861 3.6265e-08  
a 2.669443922931049 1.0062e-08 au
q 2.29926443716934 9.5419e-08 au
i 2.62463939925985 3.7021e-06 deg
node 95.77594062274628 8.0244e-05 deg
peri 244.0782752777866 8.1373e-05 deg
M 175.6936382209384 1.4696e-05 deg
tp 2458223.030849718475
(2018-Apr-14.53084972)
6.4081e-05 TDB
period 1593.050818091563
4.36
9.0073e-06
2.466e-08
d
yr
n .2259814915579852 1.2777e-09 deg/d
Q 3.039623408692758 1.1458e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2751  
   data-arc span      30940 days (84.71 yr)  
   first obs. used      1935-09-28  
   last obs. used      2020-06-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45058  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:51:46  

Additional Information
 Earth MOID = 1.29196 au 
 Jupiter MOID = 2.33539 au 
 T_jup = 3.366 
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Orbital Elements at Epoch 2456677.5 (2014-Jan-20.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1388433998954916 3.6398e-08  
q 2.298302434833628 9.5844e-08 au
tp 2456623.226799074560
(2013-Nov-26.72679907)
6.2572e-05 TDB
node 95.89450593758171 8.0122e-05 deg
peri 242.7335168647429 8.1247e-05 deg
i 2.626317077705558 3.7063e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2751  
   data-arc span      30940 days (84.71 yr)  
   first obs. used      1935-09-28  
   last obs. used      2020-06-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45058  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:51:46  

Additional Information
 Jupiter MOID = 2.33539 au 
 T_jup = 3.366 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.324813718636853E-15 -3.475036387164314E-15 3.15380313401701E-13 -7.208551856405508E-15 3.789014430860588E-14 8.502343842958833E-17
q -3.475036387164314E-15 9.186151435258927E-15 -7.94667259621389E-13 1.835233837218697E-14 -9.230181479491548E-14 -1.918930865137278E-16
tp 3.15380313401701E-13 -7.94667259621389E-13 3.915315296056948E-9 -1.358399434908562E-11 8.579861177987061E-10 -8.37599625183543E-13
node -7.208551856405508E-15 1.835233837218697E-14 -1.358399434908562E-11 6.419604059039197E-9 -6.41522992789364E-9 1.364634388407345E-11
peri 3.789014430860588E-14 -9.230181479491548E-14 8.579861177987061E-10 -6.41522992789364E-9 6.601111789123466E-9 -1.381932674139025E-11
i 8.502343842958833E-17 -1.918930865137278E-16 -8.37599625183543E-13 1.364634388407345E-11 -1.381932674139025E-11 1.373698929795297E-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 12.7   n/a MPO502181  
diameter diameter 23.701 km 0.336 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
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, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.031   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

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 ]
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