+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   250000 (2001 XB242) Classification: Main-belt Asteroid          SPK-ID: 2250000 [ 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 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1499179228514038 5.5323e-08   a 2.880307919566392 2.8275e-08 au q 2.44849813909255 1.6848e-07 au i 12.87159373110564 6.6358e-06 deg node 75.19018426632881 2.4186e-05 deg peri 245.7974759874627 3.5284e-05 deg M 18.22063730789014 2.5357e-05 deg tp 2458910.131334863572 (2020-Mar-01.63133486) 0.00012525 TDB period 1785.487461244083 4.89 2.6291e-05 7.198e-08 d yr n .2016256108285191 2.9689e-09 deg/d Q 3.312117700040234 3.2514e-08 au   Orbit Determination Parameters    # obs. used (total)      236      data-arc span      7414 days (20.30 yr)      first obs. used      1999-03-20      last obs. used      2019-07-07      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .65066      source      ORB      producer      Otto Matic      solution date      2019-Sep-24 04:19:29   Additional Information  Earth MOID = 1.46822 au   Jupiter MOID = 2.03809 au   T_jup = 3.241  [ 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 15.8   n/a MPO446306   diameter diameter 4.286 km 0.195 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.050   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   250000 (2001 XB242)          Discovered 2001-Dec-14 by LINEAR at Socorro Reference: 20100923/Numbers.arc Last Updated: 2010-09-27 [ show close-approach data ] Alternate Designations  2001 XB242 = 2005 PZ6  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Jul-11 09:10 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin