+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   243337 (2008 TW187) Classification: Main-belt Asteroid          SPK-ID: 2243337 [ 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 .1923778377280662 4.8903e-08   a 3.043181376794315 3.3542e-08 au q 2.457740723712305 1.5445e-07 au i 12.28284365793502 8.0275e-06 deg node 167.441815315707 2.6614e-05 deg peri 272.8746498658771 3.5004e-05 deg M 38.62906777861958 2.1352e-05 deg tp 2458792.433620598810 (2019-Nov-04.93362060) 0.00011379 TDB period 1939.055247558581 5.31 3.2059e-05 8.777e-08 d yr n .1856574228368519 3.0695e-09 deg/d Q 3.628622029876325 3.9995e-08 au   Orbit Determination Parameters    # obs. used (total)      235      data-arc span      9464 days (25.91 yr)      first obs. used      1994-03-05      last obs. used      2020-02-01      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .65553      source      ORB      producer      Otto Matic      solution date      2020-Feb-25 09:19:46   Additional Information  Earth MOID = 1.51053 au   Jupiter MOID = 1.81493 au   T_jup = 3.176  [ 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 15.9   n/a MPO454785   diameter diameter 4.219 km 0.955 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.047   0.031 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   243337 (2008 TW187)          Discovered 2008-Oct-08 by CSS at Catalina Reference: 20100626/Numbers.arc Last Updated: 2010-06-28 [ show close-approach data ] Alternate Designations  2008 TW187 = 1994 EK4  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Jul-04 03:45 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin