+ 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 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3259337631839088 4.688e-08   a 2.872095174282192 1.3106e-08 au q 1.935982385906053 1.3678e-07 au i 16.10334148581619 4.7414e-06 deg node 239.2692749625845 1.9704e-05 deg peri 173.2800713235778 2.1365e-05 deg M 324.4335523520817 1.0919e-05 deg tp 2459572.144541320746 (2021-Dec-23.64454132) 5.4642e-05 TDB period 1777.856352183922 4.87 1.2169e-05 3.332e-08 d yr n .2024910502796108 1.386e-09 deg/d Q 3.808207962658331 1.7378e-08 au   Orbit Determination Parameters    # obs. used (total)      1119      data-arc span      33451 days (91.58 yr)      first obs. used      1929-11-27      last obs. used      2021-06-28      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .55203      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 03:47:38   Additional Information  Earth MOID = .947936 au   Jupiter MOID = 1.58329 au   T_jup = 3.161  [ 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 13.47   n/a E2021B10   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 ] 2021-Aug-02 03:51 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin