+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   16438 Knofel (1989 AU6) Classification: Main-belt Asteroid          SPK-ID: 2016438 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ 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 .05528559884530775 3.3866e-08   a 2.734628970839514 1.162e-08 au q 2.583443370566924 9.5094e-08 au i 4.595723697841401 3.5727e-06 deg node 310.7498896851498 4.8019e-05 deg peri 118.4567845452465 6.4178e-05 deg M 29.89340748853516 4.0193e-05 deg tp 2458863.342688409650 (2020-Jan-14.84268841) 0.00018449 TDB period 1651.756568449514 4.52 1.0528e-05 2.882e-08 d yr n .2179497916802159 1.3891e-09 deg/d Q 2.885814571112104 1.2262e-08 au   Orbit Determination Parameters    # obs. used (total)      1793      data-arc span      12125 days (33.20 yr)      first obs. used      1987-08-25      last obs. used      2020-11-04      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53238      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 03:02:38   Additional Information  Earth MOID = 1.6017 au   Jupiter MOID = 2.26943 au   T_jup = 3.346  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.1   n/a MPO350933   diameter diameter 10.651 km 1.326 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   geometric albedo albedo 0.048   0.038 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   16438 Knöfel           Discovered 1989 Jan. 11 by F. Borngen at Tautenburg German meteorologist André Knöfel (b. 1963) is the head of the Fireball Data Center of the International Meteor Organization and an observer of minor planets. He has located precovery observations of many objects in the Digital Sky Survey, among them this minor planet and the transneptunian object (20000) 2000 WR 106 . NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20010309/MPCPages.arc Last Updated: 2009-05-11 Alternate Designations  1989 AU6 = 1999 HX3  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-20 21:14 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin