+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   49833 (1999 XB84) Classification: Main-belt Asteroid          SPK-ID: 2049833 [ 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 21 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1688315526209962 3.5145e-08   a 2.417880756328683 1.0817e-08 au q 2.009666194185283 8.4885e-08 au i 3.965341585814628 3.7715e-06 deg node 116.2300156162873 5.7749e-05 deg peri 299.2661497793668 5.9368e-05 deg M 187.3830063512119 1.6882e-05 deg tp 2459658.963631393184 (2022-Mar-20.46363139) 6.7211e-05 TDB period 1373.253596247014 3.76 9.2151e-06 2.523e-08 d yr n .2621511430837317 1.7591e-09 deg/d Q 2.826095318472083 1.2643e-08 au   Orbit Determination Parameters    # obs. used (total)      868      data-arc span      8987 days (24.61 yr)      first obs. used      1995-11-16      last obs. used      2020-06-24      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .5719      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 23:30:39   Additional Information  Earth MOID = 1.02501 au   Jupiter MOID = 2.51852 au   T_jup = 3.493  [ 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 15.7   n/a MPO337656   diameter diameter 4.282 km 0.042 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.064   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   49833 (1999 XB84)          Discovered 1999-Dec-07 by LINEAR at Socorro Reference: 20021120/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1999 XB84 = 1995 WR2  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-25 08:53 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin