+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1091135568143387 3.2964e-08   a 2.645270102014448 1.0548e-08 au q 2.356635272449023 8.7426e-08 au i 1.71746755114588 3.5959e-06 deg node 156.4735898645268 0.0001147 deg peri 174.0991157104631 0.0001159 deg M 96.97354856271271 1.5568e-05 deg tp 2458777.194170594060 (2019-Oct-20.69417059) 6.8237e-05 TDB period 1571.460473962008 4.30 9.3997e-06 2.573e-08 d yr n .2290862582705363 1.3703e-09 deg/d Q 2.933904931579873 1.1699e-08 au   Orbit Determination Parameters    # obs. used (total)      1277      data-arc span      9128 days (24.99 yr)      first obs. used      1996-02-12      last obs. used      2021-02-08      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .52487      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:20:14   Additional Information  Earth MOID = 1.34379 au   Jupiter MOID = 2.37183 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 14.88   n/a E2021B10   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-Apr-18 00:54 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin