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7401 Toynbee (1987 QW7)
Classification: Main-belt Asteroid          SPK-ID: 2007401
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1861786026272849 3.9298e-08  
a 2.436814207632787 7.7422e-09 au
q 1.9831315435934 9.4096e-08 au
i 2.039557823027044 3.7686e-06 deg
node 225.3288827084101 9.0792e-05 deg
peri 144.9593287150134 9.1143e-05 deg
M 180.6406846424677 8.5825e-06 deg
tp 2459692.734899490696
3.4627e-05 TDB
period 1389.415226746879
n .2591018099340178 1.2348e-09 deg/d
Q 2.890496871672173 9.1836e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1878  
   data-arc span      14419 days (39.48 yr)  
   first obs. used      1980-11-30  
   last obs. used      2020-05-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49468  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:28:24  

Additional Information
 Earth MOID = .983256 au 
 Jupiter MOID = 2.57795 au 
 T_jup = 3.479 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.4   n/a MPO332889  
diameter diameter 7.833 km 0.080 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
geometric albedo albedo 0.052   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

7401 Toynbee           Discovered 1987 Aug. 21 by E. W. Elst at the European Southern Observatory.
In his twelve-volume work A Study of History (1934-1961), renowned British historian Arnold J. Toynbee (1889-1975) analyzed the rise and fall of civilizations.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20071124/MPCPages.arcLast Updated: 2007-11-26

[ show close-approach data ]
Alternate Designations
 1987 QW7 = 1980 WP2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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