+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3263777494680482 4.6872e-08   a 2.8735725123476 1.3165e-08 au q 1.935702382834345 1.3702e-07 au i 16.10734190217803 4.7768e-06 deg node 239.3333852750627 1.9699e-05 deg peri 173.1780870383062 2.1369e-05 deg M 284.8445066636196 1.0868e-05 deg tp 2459571.941048927177 (2021-Dec-23.44104893) 5.5281e-05 TDB period 1779.228259673398 4.87 1.2227e-05 3.348e-08 d yr n .2023349157381768 1.3904e-09 deg/d Q 3.811442641860855 1.7461e-08 au   Orbit Determination Parameters    # obs. used (total)      1077      data-arc span      33160 days (90.79 yr)      first obs. used      1929-11-27      last obs. used      2020-09-10      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .55328      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 00:54:54   Additional Information  Earth MOID = .947351 au   Jupiter MOID = 1.57926 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 13.47   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-Apr-15 23:54 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin