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20991 Jankollar (1984 WX1)
Classification: Main-belt Asteroid          SPK-ID: 2020991
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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06844514394847094 3.4309e-08  
a 2.968201520715303 1.4254e-08 au
q 2.765042540361873 1.0555e-07 au
i 11.2606898075682 3.8899e-06 deg
node 126.4960565123325 1.8374e-05 deg
peri 332.9754754194348 3.4673e-05 deg
M 4.241854921230721 2.8143e-05 deg
tp 2459178.491430685505
(2020-Nov-24.99143069)
0.00014602 TDB
period 1867.834968509352
5.11
1.3455e-05
3.684e-08
d
yr
n .1927365137013696 1.3883e-09 deg/d
Q 3.171360501068732 1.5229e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1756  
   data-arc span      13255 days (36.29 yr)  
   first obs. used      1984-11-28  
   last obs. used      2021-03-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .515  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:35:42  

Additional Information
 Earth MOID = 1.78644 au 
 Jupiter MOID = 1.93313 au 
 T_jup = 3.231 
[ 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 13.8   n/a MPO358830  
diameter diameter 7.069 km 0.178 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.128   0.023 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20991 Jánkollár           Discovered 1984 Nov. 28 by M. Antal at Piszkéstető.
Ján Kollár (1793-1852), a great Slovak poet and a herald of Slavonic mutuality, was author of the extensive poetic work Slávy dcera ("Daughter of sláva", 1824-1832) and the folk verbal arts collection Národnie zpievanky ("National songs"). His work belongs equally to the literary heritage of both the Czech and Slovak republics.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010804/MPCPages.arcLast Updated: 2009-05-11

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Alternate Designations
 1984 WX1 = 1999 XC105 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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