+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   100955 (1998 QJ9) Classification: Main-belt Asteroid          SPK-ID: 2100955 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2276612377355354 4.6651e-08   a 2.301136800236064 8.1657e-09 au q 1.777257148095532 1.0753e-07 au i 5.094529681328259 3.8106e-06 deg node 257.60551656 6.4257e-05 deg peri 121.1111511831029 6.5257e-05 deg M 104.6781311911112 1.1476e-05 deg tp 2458829.763331119077 (2019-Dec-12.26333112) 4.0424e-05 TDB period 1275.005574502133 3.49 6.7866e-06 1.858e-08 d yr n .2823517066900462 1.5029e-09 deg/d Q 2.825016452376595 1.0025e-08 au   Orbit Determination Parameters    # obs. used (total)      723      data-arc span      8246 days (22.58 yr)      first obs. used      1998-08-17      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .55821      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 15:34:31   Additional Information  Earth MOID = .784943 au   Jupiter MOID = 2.66226 au   T_jup = 3.551  [ hide covariance matrix ] Orbital Elements at Epoch 2457599.5 (2016-Jul-30.0) TDB Reference: JPL 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2288961255749946 4.6922e-08   q 1.773876776365726 1.083e-07 au tp 2457553.753377637445 (2016-Jun-14.25337764) 3.9662e-05 TDB node 257.67014454824 6.4381e-05 deg peri 120.7840988793637 6.5342e-05 deg i 5.089754752051859 3.8075e-06 deg   Orbit Determination Parameters    # obs. used (total)      723      data-arc span      8246 days (22.58 yr)      first obs. used      1998-08-17      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .55821      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 15:34:31   Additional Information  Jupiter MOID = 2.66226 au   T_jup = 3.551  Orbit Covariance (6×6)   e q tp node peri i e 2.201665192520474E-15 -5.073342683721116E-15 -1.01645815019941E-12 1.74602244951565E-14 -2.651520546586019E-13 -5.734562257459124E-15 q -5.073342683721116E-15 1.172983528462731E-14 2.326365739363643E-12 -3.834759229234223E-14 6.031971698404621E-13 1.333343294499898E-14 tp -1.01645815019941E-12 2.326365739363643E-12 1.57306780513907E-9 -8.018622626381494E-12 4.752932284852739E-10 5.761330683880023E-12 node 1.74602244951565E-14 -3.834759229234223E-14 -8.018622626381494E-12 4.14487163668014E-9 -4.13137175478693E-9 4.089983898354146E-11 peri -2.651520546586019E-13 6.031971698404621E-13 4.752932284852739E-10 -4.13137175478693E-9 4.269519130018796E-9 -3.919959316841243E-11 i -5.734562257459124E-15 1.333343294499898E-14 5.761330683880023E-12 4.089983898354146E-11 -3.919959316841243E-11 1.449740911110405E-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.86   n/a E2021B55   100955 (1998 QJ9)          Discovered 1998-Aug-17 by LINEAR at Socorro Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 Alternate Designations  1998 QJ9 = 2002 VV56  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-20 20:49 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin