+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   66400 (1999 LT7) Classification: Aten [NEO]          SPK-ID: 2066400 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2456128.5 (2012-Jul-20.0) TDB Reference: JPL 83 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5725539215551606 5.179e-08   a .8552509082427779 2.4706e-09 au q .3655736468147626 4.3985e-08 au i 9.065620769342509 6.8242e-06 deg node 79.89379091285117 1.9287e-05 deg peri 341.3047961790854 2.0146e-05 deg M 75.81136557826373 1.5863e-05 deg tp 2456067.662611712150 (2012-May-20.16261171) 1.2842e-05 TDB period 288.8941468943211 0.79 1.2518e-06 3.427e-09 d yr n 1.246131165584638 5.3996e-09 deg/d Q 1.344928169670793 3.8851e-09 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A2 [EST] -4.236770278558055E-14 9.043E-15 ALN [SET] 1. n/a NK [SET] 0. n/a NM [SET] 2. n/a R0 [SET] 1. n/a   Orbit Determination Parameters    # obs. used (total)      374      data-arc span      11393 days (31.19 yr)      first obs. used      1987-04-21      last obs. used      2018-06-30      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53372      source      ORB      producer      Otto Matic      solution date      2019-Jan-14 15:34:15   Additional Information  Earth MOID = .0587702 au   Jupiter MOID = 4.00855 au   T_jup = 6.740   Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2  [ 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 19.1   n/a MPO436244   diameter diameter 0.411 km 0.076 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)   geometric albedo albedo 0.182   0.089 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)   66400 (1999 LT7)          Discovered 1999-Jun-09 by LINEAR at Socorro Reference: 20030910/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-25 03:09 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin