+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   49846 (1999 XE93) Classification: Main-belt Asteroid          SPK-ID: 2049846 [ 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 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1412159290007746 4.3457e-08   a 2.553587373207912 1.3937e-08 au q 2.192980160015709 1.1056e-07 au i 9.246510072977951 4.3182e-06 deg node 277.57840509374 3.4107e-05 deg peri 329.1616322364711 3.8569e-05 deg M 238.7047972841468 2.0279e-05 deg tp 2459502.687194290133 (2021-Oct-15.18719429) 8.5402e-05 TDB period 1490.47436251837 4.08 1.2202e-05 3.341e-08 d yr n .2415338425491119 1.9773e-09 deg/d Q 2.914194586400115 1.5905e-08 au   Orbit Determination Parameters    # obs. used (total)      1448      data-arc span      9123 days (24.98 yr)      first obs. used      1995-11-24      last obs. used      2020-11-15      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46135      source      ORB      producer      Otto Matic      solution date      2020-Dec-17 21:28:47   Additional Information  Earth MOID = 1.18435 au   Jupiter MOID = 2.16153 au   T_jup = 3.407  [ 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 14.1   n/a MPO493212   diameter diameter 3.324 km 0.278 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.636   0.187 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   49846 (1999 XE93)          Discovered 1999-Dec-07 by LINEAR at Socorro Reference: 20021120/Numbers.arc Last Updated: 2004-04-19 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-23 12:25 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin