+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   100993 (1998 QG39) Classification: Main-belt Asteroid          SPK-ID: 2100993 [ 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 27 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3073798223136225 3.6895e-08   a 2.698062144117441 8.0159e-09 au q 1.868732281667511 1.0112e-07 au i 8.906527142614328 4.3674e-06 deg node 344.2500811155225 2.4638e-05 deg peri 11.23060533750416 2.5318e-05 deg M 2.83495998165531 6.5227e-06 deg tp 2459187.752624424070 (2020-Dec-04.25262442) 2.9301e-05 TDB period 1618.737208648518 4.43 7.2138e-06 1.975e-08 d yr n .2223955797621799 9.911e-10 deg/d Q 3.527392006567371 1.048e-08 au   Orbit Determination Parameters    # obs. used (total)      1068      data-arc span      9079 days (24.86 yr)      first obs. used      1996-03-12      last obs. used      2021-01-19      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50169      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 08:26:45   Additional Information  Earth MOID = .863124 au   Jupiter MOID = 1.92767 au   T_jup = 3.282  [ 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 15.07   n/a E2021B55   diameter diameter 4.783 km 1.592 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.093   0.049 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   100993 (1998 QG39)          Discovered 1998-Aug-17 by LINEAR at Socorro Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  1998 QG39 = 1996 EC9  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-28 16:48 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin