+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   3988 (1986 LA) Classification: Amor [NEO]          SPK-ID: 2003988 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 88 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3166339760698687 3.2798e-08   a 1.544584794053296 2.037e-09 AU q 1.055516769335142 5.0439e-08 AU i 10.7680178966114 6.4022e-06 deg node 229.8802988935636 2.2272e-05 deg peri 86.78277873297345 3.0413e-05 deg M 319.7906098883102 8.9507e-06 deg tp 2456478.814295329083 (2013-Jul-05.31429533) 1.7455e-05 JED period 701.1582677617777 1.92 1.387e-06 3.797e-09 d yr n .5134361478032402 1.0157e-09 deg/d Q 2.03365281877145 2.6819e-09 AU   Orbit Determination Parameters    # obs. used (total)      414      data-arc span      9872 days (27.03 yr)      first obs. used      1986-06-04      last obs. used      2013-06-14      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .53763      data source      ORB      producer      Otto Matic      solution date      2013-Jun-15 01:49:01   Additional Information  Earth MOID = .177747 AU   T_jup = 4.384  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 18.2 mag n/a PDS3 (MPC 28111)   diameter diameter 0.7 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543 based on assumed medium albedo (0.15) rotation period rot_per 10.4 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Skiff, B.A. (2011) Posting on CALL web site. http://www.minorplanet.info/call.html] 3988 (1986 LA)          Discovered 1986-Jun-04 by Helin, E. F. at Palomar (675) Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-Jun-19 12:32 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin