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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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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 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
(2022-Apr-23.23489949)
3.4627e-05 TDB
period 1389.415226746879
3.80
6.6216e-06
1.813e-08
d
yr
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 
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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] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.052   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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

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Alternate Designations
 1987 QW7 = 1980 WP2 
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