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

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1136013698176439 5.2925e-08  
a 2.619113256929405 1.6065e-08 au
q 2.321578403234674 1.4634e-07 au
i 2.602880278865488 4.3183e-06 deg
node 232.997556588997 0.00010474 deg
peri 139.5698894623845 0.00010665 deg
M 321.6497271538822 2.3874e-05 deg
tp 2459365.428535419427
(2021-May-30.92853542)
0.00010367 TDB
period 1548.209917286262
4.24
1.4244e-05
3.9e-08
d
yr
n .2325266076521562 2.1393e-09 deg/d
Q 2.916648110624136 1.789e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1162  
   data-arc span      10656 days (29.17 yr)  
   first obs. used      1991-09-13  
   last obs. used      2020-11-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55065  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:11:22  

Additional Information
 Earth MOID = 1.32114 au 
 Jupiter MOID = 2.55528 au 
 T_jup = 3.395 
[ 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 14.71   n/a E2021B10  
diameter diameter 3.040 km 1.061 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 7.576 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.332   0.143 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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 | Mission Design | Physical Parameters | Discovery Circumstances ]
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