+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   243584 (1997 TU20) Classification: Main-belt Asteroid          SPK-ID: 2243584 [ 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 15 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2209192676233969 7.7977e-08   a 2.640188325081744 1.9681e-08 au q 2.056919853916843 2.0904e-07 au i 1.126277957650073 7.7017e-06 deg node 297.1784276006758 0.00028107 deg peri 54.72642854067143 0.00028169 deg M 110.7384577384548 1.6308e-05 deg tp 2458518.500312925676 (2019-Feb-04.00031293) 6.8703e-05 TDB period 1566.934296272942 4.29 1.752e-05 4.797e-08 d yr n .2297479867894168 2.5689e-09 deg/d Q 3.223456796246646 2.4028e-08 au   Orbit Determination Parameters    # obs. used (total)      269      data-arc span      8151 days (22.32 yr)      first obs. used      1997-09-30      last obs. used      2020-01-24      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53775      source      ORB      producer      Otto Matic      solution date      2020-Feb-25 09:22:43   Additional Information  Earth MOID = 1.05164 au   Jupiter MOID = 2.21704 au   T_jup = 3.360  [ 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 16.7   n/a MPO454788   diameter diameter 2.655 km 0.133 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.052   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   243584 (1997 TU20)          Discovered 1997-Oct-04 by Spacewatch at Kitt Peak Reference: 20100726/Numbers.arc Last Updated: 2010-07-28 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Jul-08 05:03 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin