+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   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 ] [ show orbit diagram ] 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.arc Last Updated: 2009-05-11 [ show close-approach data ] Alternate Designations  1984 WX1 = 1999 XC105  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Nov-30 06:17 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin