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20012 Ranke (1991 RV4)
Classification: Main-belt Asteroid          SPK-ID: 2020012
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1147847714215501 7.5358e-08  
a 2.617448025920932 2.2226e-08 AU
q 2.31700485255781 2.0371e-07 AU
i 2.605395844647741 6.61e-06 deg
node 233.0880155130959 0.00014857 deg
peri 140.3861336285773 0.00015112 deg
M 168.8621598868391 2.8651e-05 deg
tp 2456274.986720186475
(2012-Dec-13.48672019)
0.00011971 JED
period 1546.733625271043
4.23
1.9701e-05
5.394e-08
d
yr
n .23274854449286 2.9646e-09 deg/d
Q 2.917891199284053 2.4777e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      761  
   data-arc span      8648 days (23.68 yr)  
   first obs. used      1991-09-13  
   last obs. used      2015-05-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .55305  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 16:35:50  

Additional Information
 Earth MOID = 1.31825 AU 
 T_jup = 3.396 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.6 mag n/a MPO250411  

20012 Ranke           Discovered 1991 Sept. 13 by F. Borngen and L. D. Schmadel at Tautenburg.
Leopold von Ranke (1795-1886) was a professor of history in Berlin from 1825 to 1871. Treading new paths, he created the basis for the modern study of history by exact research and criticism of original sources. His complete works cover 54 volumes. The name was suggested by the first discoverer.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010509/MPCPages.arcLast Updated: 2009-05-11
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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