+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   120811 (1998 HT17) Classification: Main-belt Asteroid          SPK-ID: 2120811 [ 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 .1700780959316882 4.2348e-08   a 2.578683851827936 1.8617e-08 au q 2.14010621229925 1.0578e-07 au i 3.974556211769691 5.2526e-06 deg node 323.256374493712 6.6284e-05 deg peri 254.4320984634967 7.0444e-05 deg M 158.3997478534336 3.1073e-05 deg tp 2458535.000761311602 (2019-Feb-20.50076131) 0.00012473 TDB period 1512.500677396942 4.14 1.6379e-05 4.484e-08 d yr n .2380164223262171 2.5775e-09 deg/d Q 3.017261491356623 2.1783e-08 au   Orbit Determination Parameters    # obs. used (total)      411      data-arc span      8322 days (22.78 yr)      first obs. used      1998-03-25      last obs. used      2021-01-05      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .6449      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 17:08:15   Additional Information  Earth MOID = 1.13605 au   Jupiter MOID = 1.97944 au   T_jup = 3.402  [ hide covariance matrix ] Orbital Elements at Epoch 2457189.5 (2015-Jun-16.0) TDB Reference: JPL 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1691070768885158 4.2491e-08   q 2.143662294649356 1.0609e-07 au tp 2457021.379745106987 (2014-Dec-29.87974511) 0.00011254 TDB node 323.3256269453803 6.6321e-05 deg peri 254.4970994231224 7.0497e-05 deg i 3.972610158846023 5.2502e-06 deg   Orbit Determination Parameters    # obs. used (total)      411      data-arc span      8322 days (22.78 yr)      first obs. used      1998-03-25      last obs. used      2021-01-05      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .6449      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 17:08:15   Additional Information  Jupiter MOID = 1.97944 au   T_jup = 3.402  Orbit Covariance (6×6)   e q tp node peri i e 1.805459377584685E-15 -4.464128408226598E-15 4.489092312244262E-13 -7.518897633131478E-15 8.463233726949243E-14 1.673058115108774E-15 q -4.464128408226598E-15 1.125498720462859E-14 1.154840941220277E-13 1.851846643987531E-14 4.655639234856201E-14 -4.614286484416855E-15 tp 4.489092312244262E-13 1.154840941220277E-13 1.266439275257564E-8 -9.315104390178708E-12 2.712052627743841E-9 -2.913208740983878E-12 node -7.518897633131478E-15 1.851846643987531E-14 -9.315104390178708E-12 4.398435398952403E-9 -4.389415709828976E-9 5.246462141304197E-11 peri 8.463233726949243E-14 4.655639234856201E-14 2.712052627743841E-9 -4.389415709828976E-9 4.969758313333151E-9 -5.301117662843615E-11 i 1.673058115108774E-15 -4.614286484416855E-15 -2.913208740983878E-12 5.246462141304197E-11 -5.301117662843615E-11 2.756458232913155E-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 16.15   n/a E2021B55   120811 (1998 HT17)          Discovered 1998-Apr-18 by LINEAR at Socorro Reference: 20060314/Numbers.arc Last Updated: 2006-03-23 [ show close-approach data ] Alternate Designations  1998 HT17 = 2002 CW240  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-23 10:25 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin