+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   407139 (2009 TD2) Classification: Main-belt Asteroid          SPK-ID: 2407139 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2767085966334609 4.2491e-08   a 3.05602151456912 3.9593e-08 au q 2.210394089991035 1.3914e-07 au i 3.336558314070029 1.1139e-05 deg node 327.5831679748558 8.8393e-05 deg peri 75.22323666322048 9.3168e-05 deg M 24.94249957850813 2.8531e-05 deg tp 2459065.301924156848 (2020-Aug-03.80192416) 0.00015301 TDB period 1951.340407978702 5.34 3.7922e-05 1.038e-07 d yr n .1844885692563024 3.5853e-09 deg/d Q 3.901648939147205 5.0549e-08 au   Orbit Determination Parameters    # obs. used (total)      174      data-arc span      7653 days (20.95 yr)      first obs. used      2000-02-04      last obs. used      2021-01-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53485      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 17:12:17   Additional Information  Earth MOID = 1.22106 au   Jupiter MOID = 1.55537 au   T_jup = 3.173  [ 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 16.7   n/a MPO476941   diameter diameter 2.236 km 1.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.067   0.038 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   407139 (2009 TD2)          Discovered 2009-Oct-11 by Astronomical Research Observatory at Charleston Reference: Last Updated: 2014-09-12 [ show close-approach data ] Alternate Designations  2009 TD2 = 2000 CP143  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-12 15:31 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin