+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15304 Wikberg (1992 UX4) Classification: Main-belt Asteroid          SPK-ID: 2015304 [ 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 21 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3271951275554393 4.7041e-08   a 2.872439365043214 1.2895e-08 au q 1.932591200602634 1.3762e-07 au i 16.13117196443547 4.8077e-06 deg node 239.4169718253519 1.9836e-05 deg peri 173.1591000723481 2.1502e-05 deg M 244.3801568556595 1.071e-05 deg tp 2459571.590067251940 (2021-Dec-23.09006725) 5.5304e-05 TDB period 1778.17594817211 4.87 1.1974e-05 3.278e-08 d yr n .2024546560592414 1.3633e-09 deg/d Q 3.812287529483793 1.7114e-08 au   Orbit Determination Parameters    # obs. used (total)      1046      data-arc span      33117 days (90.67 yr)      first obs. used      1929-11-27      last obs. used      2020-07-29      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55153      source      ORB      producer      Otto Matic      solution date      2020-Aug-25 00:58:49   Additional Information  Earth MOID = .945021 au   Jupiter MOID = 1.57729 au   T_jup = 3.160  [ 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 13.5   n/a MPO473973   15304 Wikberg           Discovered 1992 Oct. 21 by C. S. Shoemaker and E. M. Shoemaker at Palomar. Leonard Wikberg III (b. 1959) is a well-known planetary animator and the creator of extraordinary space images. As a graphics artist, he has helped to produce programs for Canadian, English, German and Japanese television. His web site is a repository for information on cratering. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20020427/MPCPages.arc Last Updated: 2003-10-02 [ show close-approach data ] Alternate Designations  1992 UX4 = 1987 WH1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-24 04:13 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin