+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   102181 (1999 RT240) Classification: Main-belt Asteroid          SPK-ID: 2102181 [ 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 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .209001629180614 5.3447e-08   a 2.58416859879517 1.2859e-08 au q 2.044073151569595 1.3536e-07 au i 14.61141296083701 6.1974e-06 deg node 47.27374643565383 1.4107e-05 deg peri 309.7602733708498 1.9906e-05 deg M 44.6805734920906 1.3775e-05 deg tp 2459012.180222547746 (2020-Jun-11.68022255) 5.7951e-05 TDB period 1517.328775889874 4.15 1.1326e-05 3.101e-08 d yr n .2372590606072631 1.7709e-09 deg/d Q 3.124264046020745 1.5547e-08 au   Orbit Determination Parameters    # obs. used (total)      656      data-arc span      7822 days (21.42 yr)      first obs. used      1999-09-11      last obs. used      2021-02-09      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .48479      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 15:40:45   Additional Information  Earth MOID = 1.07287 au   Jupiter MOID = 2.42104 au   T_jup = 3.347  [ hide covariance matrix ] Orbital Elements at Epoch 2458121.5 (2018-Jan-03.0) TDB Reference: JPL 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2107026547892143 5.3553e-08   q 2.038593337744745 1.3585e-07 au tp 2457495.538911843284 (2016-Apr-17.03891184) 5.7948e-05 TDB node 47.30150776030221 1.4091e-05 deg peri 309.8257380654154 1.9823e-05 deg i 14.6256158466395 6.2021e-06 deg   Orbit Determination Parameters    # obs. used (total)      656      data-arc span      7822 days (21.42 yr)      first obs. used      1999-09-11      last obs. used      2021-02-09      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .48479      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 15:40:45   Additional Information  Jupiter MOID = 2.42104 au   T_jup = 3.347  Orbit Covariance (6×6)   e q tp node peri i e 2.867902992585043E-15 -7.256408738933896E-15 1.628729401445639E-12 -1.117389829562702E-14 3.088854961444761E-13 -7.04238200571014E-15 q -7.256408738933896E-15 1.845391194820218E-14 -4.293400501286032E-12 2.650991368716829E-14 -8.116302897747088E-13 1.887082500849901E-14 tp 1.628729401445639E-12 -4.293400501286032E-12 3.357920368882386E-9 -1.094465469548413E-11 8.052685716555432E-10 -1.305322698862385E-11 node -1.117389829562702E-14 2.650991368716829E-14 -1.094465469548413E-11 1.985571897403756E-10 -1.937535982451973E-10 3.940848792970079E-12 peri 3.088854961444761E-13 -8.116302897747088E-13 8.052685716555432E-10 -1.937535982451973E-10 3.929623280240896E-10 -6.849577164487973E-12 i -7.04238200571014E-15 1.887082500849901E-14 -1.305322698862385E-11 3.940848792970079E-12 -6.849577164487973E-12 3.846598415586576E-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 15.34   n/a E2021B55   102181 (1999 RT240)          Discovered 1999-Sep-11 by LONEOS at Anderson Mesa Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-15 07:10 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin