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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06827752934744161 3.5215e-08  
a 2.967552514093227 1.6576e-08 au
q 2.764935360222153 1.1012e-07 au
i 11.26056810372343 3.9633e-06 deg
node 126.4970172520624 2.0861e-05 deg
peri 333.0942240250308 3.8392e-05 deg
M 325.5782023982678 3.2233e-05 deg
tp 2459179.036531071221
(2020-Nov-25.53653107)
0.00016755 TDB
period 1867.222389989452
5.11
1.5645e-05
4.283e-08
d
yr
n .1927997446528228 1.6154e-09 deg/d
Q 3.170169667964301 1.7708e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1502  
   data-arc span      13121 days (35.92 yr)  
   first obs. used      1984-11-28  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54181  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:59:33  

Additional Information
 Earth MOID = 1.78643 au 
 Jupiter MOID = 1.93432 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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