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21564 Widmanstatten (1998 QQ101)
Classification: Main-belt Asteroid          SPK-ID: 2021564
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1810694624271416 7.2657e-09  
a 3.096607593491051 1.3964e-08 au
q 2.535906521189822 1.9259e-08 au
i 16.79642565557056 5.2555e-07 deg
node 164.4976765700485 2.8429e-06 deg
peri 214.3233252449841 9.203e-06 deg
M 16.18849629557051 6.4875e-06 deg
tp 2459110.998214771099
(2020-Sep-18.49821477)
3.5833e-05 TDB
period 1990.341912807587
5.45
1.3463e-05
3.686e-08
d
yr
n .1808734457549467 1.2235e-09 deg/d
Q 3.65730866579228 1.6493e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2370  
   data-arc span      18062 days (49.45 yr)  
   first obs. used      1971-09-27  
   last obs. used      2021-03-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44772  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:48:25  

Additional Information
 Earth MOID = 1.55141 au 
 Jupiter MOID = 1.85744 au 
 T_jup = 3.133 
[ 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 12.66   n/a E2021B10  
diameter diameter 18.289 km 0.901 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.058   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

21564 Widmanstätten           Discovered 1998 Aug. 26 by E. W. Elst at the European Southern Observatory.
Count Alois von Widmanstätten (1754-1849) was an Austrian chemist who discovered typical patterns by acid etching iron meteorites. These unique Widmanstätten patterns can be used to determine if a piece of iron is in fact a meteorite.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20070402/MPCPages.arcLast Updated: 2007-07-05

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Alternate Designations
 1998 QQ101 = 1971 SG3 = 1987 QY9 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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