+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   102934 (1999 XY42) Classification: Main-belt Asteroid          SPK-ID: 2102934 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .028903926811684 6.2138e-08   a 2.629493893863093 1.698e-08 au q 2.553491194803104 1.7215e-07 au i 21.31361569443447 5.3291e-06 deg node 244.0162470735256 1.6781e-05 deg peri 186.6564627265436 0.00014833 deg M 323.1674929578873 0.00014493 deg tp 2459359.843905192020 (2021-May-25.34390519) 0.0006271 TDB period 1557.423332697388 4.26 1.5085e-05 4.13e-08 d yr n .231151025184974 2.2389e-09 deg/d Q 2.705496592923082 1.747e-08 au   Orbit Determination Parameters    # obs. used (total)      848      data-arc span      7759 days (21.24 yr)      first obs. used      1999-10-14      last obs. used      2021-01-10      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46928      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 08:32:49   Additional Information  Earth MOID = 1.56689 au   Jupiter MOID = 2.47098 au   T_jup = 3.303  [ 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 15.10   n/a E2021B55   diameter diameter 2.978 km 0.391 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.263   0.065 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   102934 (1999 XY42)          Discovered 1999-Dec-07 by LINEAR at Socorro Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-05 01:58 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin