+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   31669 (1999 JT6) Classification: Apollo [NEO, PHA]          SPK-ID: 2031669 [ 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 65 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5773989816454501 4.4127e-08   a 2.1371179286404 2.9474e-08 AU q .9031482129871993 9.7934e-08 AU i 9.544545934249953 7.4519e-06 deg node 78.85780454958804 6.0571e-05 deg peri 39.05457920131657 6.0454e-05 deg M 211.8727927118489 2.6198e-05 deg tp 2456870.040969779526 (2014-Jul-31.54096978) 9.268e-05 JED period 1141.14585844994 3.12 2.3607e-05 6.463e-08 d yr n .3154723800943389 6.5262e-09 deg/d Q 3.371087644293601 4.6492e-08 AU   Orbit Determination Parameters    # obs. used (total)      529      data-arc span      5209 days (14.26 yr)      first obs. used      1996-06-12      last obs. used      2010-09-16      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .59552      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 15:38:04   Additional Information  Earth MOID = .000792272 AU   T_jup = 3.467  [ 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 16.0 mag n/a PDS3 (MPO 18845)   rotation period rot_per 5.807 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Published Reference List: [Gaftonyuk, N.M.; Krugly, Yu.N. (2004) Astronomical School Report 5, No. 1-2, 122-125 (in Russian).] [Galad, A.; Pravec, P.; Kusnirak, P.; Gajdos, S.; et al. (2005) Earth, Moon, and Planets, 97, 147-163.] 31669 (1999 JT6)          Discovered 1999-May-12 by LINEAR at Socorro (704) Reference: 20011130/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-22 07:27 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin