+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1399342775884508 1.7886e-08   a 3.098400042779576 1.4042e-08 au q 2.664827671113191 5.5663e-08 au i .762380441970973 1.5972e-06 deg node 42.91645972867086 8.1112e-05 deg peri 154.3756572953966 8.1928e-05 deg M 176.6798589792664 1.1291e-05 deg tp 2458222.836942503522 (2018-Apr-14.33694250) 5.8659e-05 TDB period 1992.070305761536 5.45 1.3542e-05 3.708e-08 d yr n .1807165133473429 1.2285e-09 deg/d Q 3.531972414445961 1.6007e-08 au   Orbit Determination Parameters    # obs. used (total)      2511      data-arc span      11317 days (30.98 yr)      first obs. used      1990-02-18      last obs. used      2021-02-12      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .49101      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 23:25:50   Additional Information  Earth MOID = 1.66239 au   Jupiter MOID = 1.42384 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 12.83   n/a E2021B10   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-Apr-20 09:01 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin