+ 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 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.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 ] 2021-Apr-21 12:26 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin