+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   74242 (1998 SY54) Classification: Main-belt Asteroid          SPK-ID: 2074242 [ 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 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2224816847544768 5.607e-08   a 2.600081115761379 8.8471e-09 au q 2.021610688628487 1.4651e-07 au i 9.623118049342814 6.6495e-06 deg node 6.59251383540378 1.953e-05 deg peri 20.1517337085476 2.2767e-05 deg M 45.53443452459184 8.4452e-06 deg tp 2458806.805977100882 (2019-Nov-19.30597710) 3.6071e-05 TDB period 1531.365195850261 4.19 7.816e-06 2.14e-08 d yr n .2350843554336606 1.1999e-09 deg/d Q 3.17855154289427 1.0815e-08 au   Orbit Determination Parameters    # obs. used (total)      1116      data-arc span      10436 days (28.57 yr)      first obs. used      1992-03-26      last obs. used      2020-10-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .49088      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 21:44:26   Additional Information  Earth MOID = 1.02822 au   Jupiter MOID = 2.2998 au   T_jup = 3.360  [ hide covariance matrix ] Orbital Elements at Epoch 2457223.5 (2015-Jul-20.0) TDB Reference: JPL 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2231928726439387 5.67e-08   q 2.019337861481765 1.4841e-07 au tp 2457270.832500665516 (2015-Sep-05.33250067) 3.7353e-05 TDB node 6.716926325130159 1.9442e-05 deg peri 19.20388141679493 2.2649e-05 deg i 9.649299167877315 6.6599e-06 deg   Orbit Determination Parameters    # obs. used (total)      1116      data-arc span      10436 days (28.57 yr)      first obs. used      1992-03-26      last obs. used      2020-10-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .49088      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 21:44:26   Additional Information  Jupiter MOID = 2.2998 au   T_jup = 3.360  Orbit Covariance (6×6)   e q tp node peri i e 3.214907441137746E-15 -8.406609402014568E-15 -7.700751031544258E-13 1.935055870298986E-14 -2.60988764221527E-13 -1.320808633814473E-14 q -8.406609402014568E-15 2.202672120716973E-14 1.931354516251229E-12 -5.176244860112127E-14 6.606744932975892E-13 3.525691326155918E-14 tp -7.700751031544258E-13 1.931354516251229E-12 1.39523192146577E-9 -6.81290424314952E-12 4.391541671911489E-10 1.411451690047773E-12 node 1.935055870298986E-14 -5.176244860112127E-14 -6.81290424314952E-12 3.779867515108814E-10 -3.740187023942606E-10 3.123555892391352E-11 peri -2.60988764221527E-13 6.606744932975892E-13 4.391541671911489E-10 -3.740187023942606E-10 5.12959163964495E-10 -3.048183295987552E-11 i -1.320808633814473E-14 3.525691326155918E-14 1.411451690047773E-12 3.123555892391352E-11 -3.048183295987552E-11 4.435391505423161E-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 15.0   n/a MPO406554   74242 (1998 SY54)          Discovered 1998-Sep-16 by LONEOS at Anderson Mesa Reference: 20040415/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1998 SY54 = 2000 EJ35  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-23 09:21 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin