+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   193873 (2001 QX157) Classification: Main-belt Asteroid          SPK-ID: 2193873 [ 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 .1722621825032193 3.2735e-08   a 2.198833091048801 8.8943e-09 au q 1.820057303824435 7.4405e-08 au i 1.844504301809203 5.2362e-06 deg node 189.1721176846546 0.00010736 deg peri 59.48295179959244 0.00010902 deg M 39.47340596326844 1.6036e-05 deg tp 2459069.916313939752 (2020-Aug-08.41631394) 5.3136e-05 TDB period 1190.931611663665 3.26 7.226e-06 1.978e-08 d yr n .302284359970175 1.8341e-09 deg/d Q 2.577608878273168 1.0426e-08 au   Orbit Determination Parameters    # obs. used (total)      413      data-arc span      6867 days (18.80 yr)      first obs. used      2001-08-23      last obs. used      2020-06-11      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .56357      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 22:22:05   Additional Information  Earth MOID = .805523 au   Jupiter MOID = 2.44867 au   T_jup = 3.646  [ hide covariance matrix ] Orbital Elements at Epoch 2457170.5 (2015-May-28.0) TDB Reference: JPL 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1722862713681073 3.2687e-08   q 1.819430076281838 7.4258e-08 au tp 2456688.597288640044 (2014-Jan-31.09728864) 5.659e-05 TDB node 189.2084979222054 0.00010742 deg peri 59.40592088172204 0.00010908 deg i 1.843726409366957 5.2365e-06 deg   Orbit Determination Parameters    # obs. used (total)      413      data-arc span      6867 days (18.80 yr)      first obs. used      2001-08-23      last obs. used      2020-06-11      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .56357      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 22:22:05   Additional Information  Jupiter MOID = 2.44867 au   T_jup = 3.646  Orbit Covariance (6×6)   e q tp node peri i e 1.068452657824194E-15 -2.416321045659659E-15 -4.165203941605754E-13 1.044479464002462E-14 -1.580650627944642E-13 8.808918162958323E-17 q -2.416321045659659E-15 5.514319600159053E-15 7.638334572607559E-13 -2.315892194697222E-14 3.061794349499947E-13 -1.506100613394149E-17 tp -4.165203941605754E-13 7.638334572607559E-13 3.202438913617195E-9 -4.22982041663262E-11 1.079015272784329E-9 -1.167262311585656E-12 node 1.044479464002462E-14 -2.315892194697222E-14 -4.22982041663262E-11 1.153884892532864E-8 -1.154620171376266E-8 -9.290558786750725E-11 peri -1.580650627944642E-13 3.061794349499947E-13 1.079015272784329E-9 -1.154620171376266E-8 1.189896556693542E-8 9.249634438987523E-11 i 8.808918162958323E-17 -1.506100613394149E-17 -1.167262311585656E-12 -9.290558786750725E-11 9.249634438987523E-11 2.742139046334753E-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 17.04   n/a E2021B55   193873 (2001 QX157)          Discovered 2001-Aug-23 by LONEOS at Anderson Mesa Reference: 20081113/Numbers.arc Last Updated: 2008-11-17 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-23 15:36 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin