+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   100431 (1996 HU20) Classification: Main-belt Asteroid          SPK-ID: 2100431 [ 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 .1832552921319899 4.9602e-08   a 3.104346238030672 2.3318e-08 au q 2.535458361301517 1.5059e-07 au i 2.94485519728411 5.2341e-06 deg node 208.1206724915047 9.4967e-05 deg peri 343.3496852952538 9.5883e-05 deg M 197.6202470916302 1.6866e-05 deg tp 2460101.620838071480 (2023-Jun-06.12083807) 0.00010051 TDB period 1997.807583121477 5.47 2.2509e-05 6.163e-08 d yr n .1801975340575681 2.0303e-09 deg/d Q 3.673234114759827 2.7591e-08 au   Orbit Determination Parameters    # obs. used (total)      633      data-arc span      8997 days (24.63 yr)      first obs. used      1996-04-18      last obs. used      2020-12-05      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55749      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 08:25:16   Additional Information  Earth MOID = 1.53499 au   Jupiter MOID = 1.28993 au   T_jup = 3.193  [ hide covariance matrix ] Orbital Elements at Epoch 2457148.5 (2015-May-06.0) TDB Reference: JPL 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1819859707185099 4.99e-08   q 2.541878080780287 1.5148e-07 au tp 2458106.449160449569 (2017-Dec-18.94916045) 8.6281e-05 TDB node 208.1453796013526 9.4901e-05 deg peri 343.8732694818971 9.5818e-05 deg i 2.943676529408414 5.2369e-06 deg   Orbit Determination Parameters    # obs. used (total)      633      data-arc span      8997 days (24.63 yr)      first obs. used      1996-04-18      last obs. used      2020-12-05      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55749      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 08:25:16   Additional Information  Jupiter MOID = 1.28993 au   T_jup = 3.193  Orbit Covariance (6×6)   e q tp node peri i e 2.489961604640621E-15 -7.501640000918054E-15 1.513252300462788E-13 3.108268223133928E-15 -2.913720523521565E-14 4.293215342371374E-16 q -7.501640000918054E-15 2.294740127255689E-14 4.325171318935935E-13 -8.797140382537399E-15 1.952699580530224E-13 -8.293244064794579E-16 tp 1.513252300462788E-13 4.325171318935935E-13 7.44449009047208E-9 -3.308838355916157E-12 1.163273830430827E-9 7.384047594209071E-13 node 3.108268223133928E-15 -8.797140382537399E-15 -3.308838355916157E-12 9.006284287777461E-9 -8.994524416529512E-9 -1.076221174121879E-10 peri -2.913720523521565E-14 1.952699580530224E-13 1.163273830430827E-9 -8.994524416529512E-9 9.181111852664843E-9 1.075637771886321E-10 i 4.293215342371374E-16 -8.293244064794579E-16 7.384047594209071E-13 -1.076221174121879E-10 1.075637771886321E-10 2.742503225486079E-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 14.9   n/a MPO449610   100431 (1996 HU20)          Discovered 1996-Apr-18 by Elst, E. W. at La Silla Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  1996 HU20 = 1997 NM5 = 2001 DL45  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-28 11:00 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin