+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   103151 (1999 XR217) Classification: Main-belt Asteroid          SPK-ID: 2103151 [ 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 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1634988123596755 3.1185e-08   a 2.641661724293196 1.3404e-08 au q 2.209753169715246 8.1385e-08 au i 4.795874352456737 3.6239e-06 deg node 100.8964515342328 5.9842e-05 deg peri 177.1418186745652 6.1881e-05 deg M 155.1827931470537 1.6531e-05 deg tp 2458524.486613379105 (2019-Feb-09.98661338) 7.0565e-05 TDB period 1568.246158276748 4.29 1.1936e-05 3.268e-08 d yr n .2295557990689309 1.7472e-09 deg/d Q 3.073570278871145 1.5596e-08 au   Orbit Determination Parameters    # obs. used (total)      521      data-arc span      11472 days (31.41 yr)      first obs. used      1989-09-05      last obs. used      2021-02-01      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .56811      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 15:45:21   Additional Information  Earth MOID = 1.19145 au   Jupiter MOID = 2.05282 au   T_jup = 3.371  [ hide covariance matrix ] Orbital Elements at Epoch 2457277.5 (2015-Sep-12.0) TDB Reference: JPL 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1638843405420268 3.1032e-08   q 2.208604642242024 8.1002e-08 au tp 2456958.356388742998 (2014-Oct-27.85638874) 6.8829e-05 TDB node 100.9261833103244 5.9897e-05 deg peri 177.4479384149182 6.1944e-05 deg i 4.794208789582475 3.6221e-06 deg   Orbit Determination Parameters    # obs. used (total)      521      data-arc span      11472 days (31.41 yr)      first obs. used      1989-09-05      last obs. used      2021-02-01      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .56811      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 15:45:21   Additional Information  Jupiter MOID = 2.05282 au   T_jup = 3.371  Orbit Covariance (6×6)   e q tp node peri i e 9.630141952037976E-16 -2.489993067714869E-15 -1.075859718911063E-13 2.139706170646836E-15 -4.140882393055073E-14 -4.170605788215318E-16 q -2.489993067714869E-15 6.56133906170412E-15 3.328394855808253E-13 -3.21605944391467E-15 1.232971583258608E-13 1.191448708403013E-15 tp -1.075859718911063E-13 3.328394855808253E-13 4.737476014772791E-9 4.08220697566011E-11 1.12152683771381E-9 -8.963999485765982E-13 node 2.139706170646836E-15 -3.21605944391467E-15 4.08220697566011E-11 3.587662154845212E-9 -3.565008586469487E-9 -4.083058194722042E-12 peri -4.140882393055073E-14 1.232971583258608E-13 1.12152683771381E-9 -3.565008586469487E-9 3.837058264351418E-9 3.85705311194843E-12 i -4.170605788215318E-16 1.191448708403013E-15 -8.963999485765982E-13 -4.083058194722042E-12 3.85705311194843E-12 1.311989141888469E-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 15.9   n/a MPO436484   103151 (1999 XR217)          Discovered 1999-Dec-13 by Spacewatch at Kitt Peak 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-20 18:24 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin