+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   20420 Marashwhitman (1998 SN129) Classification: Main-belt Asteroid          SPK-ID: 2020420 [ 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 32 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1090828020637934 4.0336e-08   a 2.644660317433952 1.1764e-08 au q 2.356173359501335 1.0959e-07 au i 1.717511027574029 4.0013e-06 deg node 156.4789270309941 0.00011578 deg peri 173.9776778548919 0.00011724 deg M 51.26415747195523 1.6422e-05 deg tp 2458776.800713758727 (2019-Oct-20.30071376) 7.2017e-05 TDB period 1570.9171284228 4.30 1.0482e-05 2.87e-08 d yr n .2291654941476384 1.5291e-09 deg/d Q 2.933147275366569 1.3048e-08 au   Orbit Determination Parameters    # obs. used (total)      1171      data-arc span      9041 days (24.75 yr)      first obs. used      1996-02-12      last obs. used      2020-11-13      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53516      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 03:13:44   Additional Information  Earth MOID = 1.34524 au   Jupiter MOID = 2.37254 au   T_jup = 3.384  [ 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 14.8   n/a MPO426007   20420 Marashwhitman           Discovered 1998 Sept. 26 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. David I. Marash-Whitman (b. 1991) is a finalist in the 2004 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition, for his environmental sciences project. He attends the South Peninsula Hebrew Day School, Sunnyvale, California. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20041028/MPCPages.arc Last Updated: 2004-10-29 [ show close-approach data ] Alternate Designations  1998 SN129 = 2000 AA91  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-23 12:14 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin