+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   312979 (1999 KT4) Classification: Mars-crossing Asteroid          SPK-ID: 2312979 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 9 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3673662656796456 4.8029e-08   a 2.212969656164588 9.0207e-09 au q 1.399999257517034 1.0238e-07 au i 2.290899756215913 7.2079e-06 deg node 111.4703904356285 0.00014272 deg peri 127.6760132696713 0.00014373 deg M 134.3897021731095 1.8465e-05 deg tp 2458551.625322525312 (2019-Mar-09.12532253) 5.9327e-05 TDB period 1202.435017548702 3.29 7.3522e-06 2.013e-08 d yr n .2993924783843207 1.8306e-09 deg/d Q 3.025940054812141 1.2335e-08 au   Orbit Determination Parameters    # obs. used (total)      214      data-arc span      7473 days (20.46 yr)      first obs. used      1999-03-22      last obs. used      2019-09-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .64569      source      ORB      producer      Otto Matic      solution date      2019-Sep-24 06:02:36   Additional Information  Earth MOID = .389534 au   Jupiter MOID = 1.99314 au   T_jup = 3.563  [ hide covariance matrix ] Orbital Elements at Epoch 2457296.5 (2015-Oct-01.0) TDB Reference: JPL 9 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3670592764087617 4.7998e-08   q 1.400855893514306 1.0227e-07 au tp 2457348.700575890010 (2015-Nov-22.20057589) 5.3331e-05 TDB node 111.4828876517854 0.00014278 deg peri 127.6233210251721 0.00014379 deg i 2.290568894595254 7.2057e-06 deg   Orbit Determination Parameters    # obs. used (total)      214      data-arc span      7473 days (20.46 yr)      first obs. used      1999-03-22      last obs. used      2019-09-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .64569      source      ORB      producer      Otto Matic      solution date      2019-Sep-24 06:02:36   Additional Information  Jupiter MOID = 1.99314 au   T_jup = 3.563  Orbit Covariance (6×6)   e q tp node peri i e 2.303847877432379E-15 -4.904876897731549E-15 1.442618553502393E-12 -6.936124479747824E-14 4.524584871608084E-13 -8.266090695245604E-15 q -4.904876897731549E-15 1.045946091259084E-14 -2.94334337851425E-12 1.471320733151661E-13 -9.195792671447845E-13 1.718521224974537E-14 tp 1.442618553502393E-12 -2.94334337851425E-12 2.844209448382203E-9 -1.768955064574343E-11 9.37695028781206E-10 -8.224612202825735E-12 node -6.936124479747824E-14 1.471320733151661E-13 -1.768955064574343E-11 2.038679829701813E-8 -2.037228464678802E-8 5.689283299639987E-10 peri 4.524584871608084E-13 -9.195792671447845E-13 9.37695028781206E-10 -2.037228464678802E-8 2.067518095419202E-8 -5.709205455751955E-10 i -8.266090695245604E-15 1.718521224974537E-14 -8.224612202825735E-12 5.689283299639987E-10 -5.709205455751955E-10 5.192226551200962E-11 [ 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 17.7   n/a MPO494659   312979 (1999 KT4)          Discovered 1999-May-18 by LINEAR at Socorro Reference: 20120207/Numbers.arc Last Updated: 2012-02-09 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-25 23:57 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin