+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   100936 Mekong (1998 ME43) Classification: Main-belt Asteroid          SPK-ID: 2100936 [ 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 22 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .131490188969878 3.5194e-08   a 2.408559104712715 1.0974e-08 au q 2.09185721288892 8.9774e-08 au i 2.604358836126433 3.2586e-06 deg node 283.4852803586979 0.00010568 deg peri 358.2261646364776 0.00010755 deg M 8.465527687237064 1.9037e-05 deg tp 2459168.394020597026 (2020-Nov-14.89402060) 7.2236e-05 TDB period 1365.319801918102 3.74 9.3313e-06 2.555e-08 d yr n .2636744881999408 1.8021e-09 deg/d Q 2.725260996536509 1.2417e-08 au   Orbit Determination Parameters    # obs. used (total)      729      data-arc span      10016 days (27.42 yr)      first obs. used      1993-01-21      last obs. used      2020-06-24      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .60745      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 15:34:26   Additional Information  Earth MOID = 1.07349 au   Jupiter MOID = 2.39665 au   T_jup = 3.508  [ hide covariance matrix ] Orbital Elements at Epoch 2457323.5 (2015-Oct-28.0) TDB Reference: JPL 22 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .131110598275511 3.5199e-08   q 2.093093597297324 8.9696e-08 au tp 2457802.119991401249 (2017-Feb-17.61999140) 7.4535e-05 TDB node 283.5791185798381 0.00010561 deg peri 357.7944532874083 0.00010749 deg i 2.605197191324134 3.2589e-06 deg   Orbit Determination Parameters    # obs. used (total)      729      data-arc span      10016 days (27.42 yr)      first obs. used      1993-01-21      last obs. used      2020-06-24      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .60745      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 15:34:26   Additional Information  Jupiter MOID = 2.39665 au   T_jup = 3.508  Orbit Covariance (6×6)   e q tp node peri i e 1.238980372988049E-15 -3.143612570385574E-15 2.454352204601738E-13 -4.397348826313897E-15 1.352516938111494E-13 -4.52016465058611E-16 q -3.143612570385574E-15 8.04541564933733E-15 -7.812715850581444E-13 1.329167756589057E-14 -3.927026467803263E-13 1.138954989546278E-15 tp 2.454352204601738E-13 -7.812715850581444E-13 5.555410628090692E-9 4.221527399779891E-11 1.512248912811647E-9 2.484006429029695E-12 node -4.397348826313897E-15 1.329167756589057E-14 4.221527399779891E-11 1.115403806499683E-8 -1.113115673328282E-8 -2.534875998221127E-11 peri 1.352516938111494E-13 -3.927026467803263E-13 1.512248912811647E-9 -1.113115673328282E-8 1.155404640863083E-8 2.598599182617695E-11 i -4.52016465058611E-16 1.138954989546278E-15 2.484006429029695E-12 -2.534875998221127E-11 2.598599182617695E-11 1.06205480077022E-11 [ 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 16.12   n/a E2021B55   100936 Mekong           Discovered 1998 June 26 by E. W. Elst at the European Southern Observatory. The Mekong is a 4350-kilometre river flowing through China, Myanmar, Laos, Thailand, Cambodia and Vietnam. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC batch dated 2017-03-12 Last Updated: 2017-03-14 [ show close-approach data ] Alternate Designations  1998 ME43 = 2002 PR74  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-20 18:00 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin