+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3077329086693065 3.8504e-08   a 2.699255876695192 9.1734e-09 au q 1.868606014517061 1.0484e-07 au i 8.9045115773568 4.5201e-06 deg node 344.2599810049561 2.7821e-05 deg peri 11.22017787671617 2.8492e-05 deg M 318.3878673991025 8.1295e-06 deg tp 2459187.732822042497 (2020-Dec-04.23282204) 3.7183e-05 TDB period 1619.81162036971 4.43 8.2574e-06 2.261e-08 d yr n .2222480660546395 1.133e-09 deg/d Q 3.529905738873322 1.1996e-08 au   Orbit Determination Parameters    # obs. used (total)      851      data-arc span      8913 days (24.40 yr)      first obs. used      1996-03-12      last obs. used      2020-08-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51983      source      ORB      producer      Otto Matic      solution date      2020-Aug-25 09:05:11   Additional Information  Earth MOID = .864693 au   Jupiter MOID = 1.92435 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 14.9   n/a MPO474884   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 ] 2020-Oct-19 22:15 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin