+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   58134 (1981 EW40) Classification: Main-belt Asteroid          SPK-ID: 2058134 [ 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 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1608285508004199 4.7089e-08   a 2.366169718337705 1.0481e-08 au q 1.985622071589614 1.1044e-07 au i 10.14489367806363 4.8311e-06 deg node 353.1815148853657 1.9039e-05 deg peri 344.9977831665435 2.2148e-05 deg M 179.5928573848513 1.2692e-05 deg tp 2458537.285787458585 (2019-Feb-22.78578746) 4.5048e-05 TDB period 1329.435479737784 3.64 8.8333e-06 2.418e-08 d yr n .270791629595297 1.7992e-09 deg/d Q 2.746717365085796 1.2167e-08 au   Orbit Determination Parameters    # obs. used (total)      1189      data-arc span      14589 days (39.94 yr)      first obs. used      1981-02-09      last obs. used      2021-01-19      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50114      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 05:42:28   Additional Information  Earth MOID = .977168 au   Jupiter MOID = 2.64985 au   T_jup = 3.509  [ 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 15.02   n/a E2021B10   diameter diameter 3.150 km 0.621 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.178   0.145 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   58134 (1981 EW40)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring Reference: 20030614/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1981 EW40 = 2001 XR42  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-27 05:18 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin