+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 102 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5723971837589289 5.1482e-08   a .8554610116192057 3.3907e-09 au q .365797537752808 4.3545e-08 au i 9.065591049059243 5.5235e-06 deg node 79.85359261230103 1.9136e-05 deg peri 341.3485939368355 1.9855e-05 deg M 303.2223473798775 1.4912e-05 deg tp 2459246.079933889543 (2021-Jan-31.57993389) 1.2098e-05 TDB period 289.0006092717538 0.79 1.7182e-06 4.704e-09 d yr n 1.245672114350056 7.4061e-09 deg/d Q 1.345124485485603 5.3316e-09 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A2 [EST] -2.501306797856899E-14 4.723E-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)      492      data-arc span      12466 days (34.13 yr)      first obs. used      1987-04-21      last obs. used      2021-06-07      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .47907      source      ORB      producer      Otto Matic      solution date      2021-Jun-16 06:20:48   Additional Information  Earth MOID = .0586984 au   Jupiter MOID = 3.9983 au   T_jup = 6.739   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 19.2   n/a E2021-HE8   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-Jun-23 03:50 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin