+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   120986 (1998 XM17) Classification: Main-belt Asteroid          SPK-ID: 2120986 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ 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 .1135436024824632 4.7826e-08   a 2.322038915675454 1.0458e-08 au q 2.058386252085191 1.1497e-07 au i 21.63602841380709 6.0337e-06 deg node 238.3622628073945 1.1078e-05 deg peri 218.3951939204078 2.9621e-05 deg M 15.45787539211143 2.6417e-05 deg tp 2458945.005496644434 (2020-Apr-05.50549664) 9.4752e-05 TDB period 1292.417017295857 3.54 8.731e-06 2.39e-08 d yr n .2785478643365693 1.8817e-09 deg/d Q 2.585691579265718 1.1645e-08 au   Orbit Determination Parameters    # obs. used (total)      677      data-arc span      7738 days (21.19 yr)      first obs. used      1998-11-23      last obs. used      2020-01-30      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4761      source      ORB      producer      Otto Matic      solution date      2020-Feb-24 06:25:21   Additional Information  Earth MOID = 1.09891 au   Jupiter MOID = 2.76096 au   T_jup = 3.475  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.8   n/a MPO532526   diameter diameter 1.971 km 0.550 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.287   0.238 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   120986 (1998 XM17)          Discovered 1998-Dec-15 by LINEAR at Socorro Reference: 20060314/Numbers.arc Last Updated: 2006-03-23 Alternate Designations  1998 XM17 = 2001 QE191  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-01 17:33 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin