+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   20234 Billgibson (1998 AV9) Classification: Main-belt Asteroid          SPK-ID: 2020234 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 35 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .06460462426247413 3.3132e-08   a 2.173137318986408 5.1169e-09 au q 2.032742599022531 7.2009e-08 au i .5080752204179716 2.9988e-06 deg node 311.445637619586 0.00037179 deg peri 210.8054870750092 0.00037245 deg M 139.4388023003106 2.1809e-05 deg tp 2458943.278686823842 (2020-Apr-03.77868682) 7.0822e-05 TDB period 1170.116711071703 3.20 4.1328e-06 1.131e-08 d yr n .3076616175067513 1.0866e-09 deg/d Q 2.313532038950285 5.4475e-09 au   Orbit Determination Parameters    # obs. used (total)      2222      data-arc span      10082 days (27.60 yr)      first obs. used      1993-11-13      last obs. used      2021-06-21      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .47892      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 04:57:40   Additional Information  Earth MOID = 1.04118 au   Jupiter MOID = 2.65424 au   T_jup = 3.684  [ 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 14.89   n/a E2021B10   diameter diameter 2.613 km 0.121 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.196   0.036 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   20234 Billgibson           Discovered 1998 Jan. 6 by M. W. Buie at the Anderson Mesa station of the Lowell Observatory. William C. Gibson (b. 1945) is the payload manager of the New Horizons Pluto Kuiper Belt mission. Additionally, he has been responsible for the development of numerous instruments that have studied the earth's magnetosphere, the planets and comets. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20040713/MPCPages.arc Last Updated: 2004-07-14 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jul-27 19:58 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin