+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   12561 Howard (1998 SX7) Classification: Main-belt Asteroid          SPK-ID: 2012561 [ 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 33 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1398848956096401 3.664e-08   a 3.098747471256026 1.489e-08 au q 2.665279504718741 1.1057e-07 au i .7623644707914171 3.5738e-06 deg node 42.91805580104475 0.00028377 deg peri 154.459613407367 0.00028403 deg M 140.430524864612 1.3692e-05 deg tp 2458223.292964687986 (2018-Apr-14.79296469) 7.3348e-05 TDB period 1992.405376125117 5.45 1.4361e-05 3.932e-08 d yr n .1806861215663539 1.3023e-09 deg/d Q 3.532215437793312 1.6973e-08 au   Orbit Determination Parameters    # obs. used (total)      2409      data-arc span      11220 days (30.72 yr)      first obs. used      1990-02-18      last obs. used      2020-11-07      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .49455      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:49:42   Additional Information  Earth MOID = 1.66355 au   Jupiter MOID = 1.42472 au   T_jup = 3.207  [ 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 12.8   n/a MPO350902   12561 Howard           Discovered 1998 Sept. 20 by Spacewatch at Kitt Peak. Ron Howard (b. 1954) is a noted director of such films as Apollo 13 and A Beautiful Mind. He began his career as a child star in The Andy Griffith Show, later starring in the long-running TV series Happy Days before beginning his career as a director. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20030318/MPCPages.arc Last Updated: 2003-10-02 [ show close-approach data ] Alternate Designations  1998 SX7 = 1990 DT7 = 1991 MB  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-18 18:28 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin