+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   120839 (1998 KX38) Classification: Main-belt Asteroid          SPK-ID: 2120839 [ 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 19 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1884667720237531 5.46e-08   a 2.667545593370921 1.7177e-08 au q 2.164801886162116 1.523e-07 au i 14.02962828815819 4.8494e-06 deg node 51.10437040084696 2.1069e-05 deg peri 129.9832187970697 2.493e-05 deg M 66.80730450351285 1.4197e-05 deg tp 2458705.183541116686 (2019-Aug-09.68354112) 6.1569e-05 TDB period 1591.351813818543 4.36 1.537e-05 4.208e-08 d yr n .2262227603437097 2.185e-09 deg/d Q 3.170289300579725 2.0414e-08 au   Orbit Determination Parameters    # obs. used (total)      721      data-arc span      7671 days (21.00 yr)      first obs. used      1998-05-22      last obs. used      2019-05-23      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52517      source      ORB      producer      Otto Matic      solution date      2019-Jul-13 08:35:05   Additional Information  Earth MOID = 1.19261 au   Jupiter MOID = 1.86778 au   T_jup = 3.315  [ 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 15.1   n/a MPO338106   diameter diameter 2.662 km 1.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.300   0.225 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   120839 (1998 KX38)          Discovered 1998-May-22 by LINEAR at Socorro Reference: 20060314/Numbers.arc Last Updated: 2006-03-23 [ show close-approach data ] Alternate Designations  1998 KX38 = 2000 WP139  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-24 04:40 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin