+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   90976 (1997 WH38) Classification: Main-belt Asteroid          SPK-ID: 2090976 [ 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 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1638151260274518 4.4091e-08   a 2.290087455107901 9.966e-09 au q 1.914936490035514 1.0213e-07 au i 4.897544934833808 4.2969e-06 deg node 246.8849755100286 5.2996e-05 deg peri 150.4818814191111 5.4626e-05 deg M 255.1845589891011 1.6409e-05 deg tp 2459569.052442440459 (2021-Dec-20.55244244) 5.9307e-05 TDB period 1265.833335231295 3.47 8.263e-06 2.262e-08 d yr n .2843976295933305 1.8565e-09 deg/d Q 2.665238420180289 1.1599e-08 au   Orbit Determination Parameters    # obs. used (total)      688      data-arc span      8267 days (22.63 yr)      first obs. used      1997-11-26      last obs. used      2020-07-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .53881      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 14:42:51   Additional Information  Earth MOID = .923284 au   Jupiter MOID = 2.74655 au   T_jup = 3.576  [ hide covariance matrix ] Orbital Elements at Epoch 2457427.5 (2016-Feb-09.0) TDB Reference: JPL 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1631224697237891 4.3918e-08   q 1.917041054413629 1.0149e-07 au tp 2457038.484042953951 (2015-Jan-15.98404295) 5.0193e-05 TDB node 246.9553195427672 5.3045e-05 deg peri 150.6317909613758 5.4696e-05 deg i 4.894345970858527 4.2943e-06 deg   Orbit Determination Parameters    # obs. used (total)      688      data-arc span      8267 days (22.63 yr)      first obs. used      1997-11-26      last obs. used      2020-07-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .53881      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 14:42:51   Additional Information  Jupiter MOID = 2.74655 au   T_jup = 3.576  Orbit Covariance (6×6)   e q tp node peri i e 1.92877693608361E-15 -4.442331794299251E-15 -7.317779337898229E-13 2.256980545387359E-14 -2.105130056929654E-13 -1.846910067547325E-15 q -4.442331794299251E-15 1.030097184220991E-14 1.865385233585849E-12 -5.068967440480308E-14 5.337796737180139E-13 4.188510803716977E-15 tp -7.317779337898229E-13 1.865385233585849E-12 2.519302065298533E-9 -2.287333881601601E-12 6.919610278536872E-10 1.752766251255035E-12 node 2.256980545387359E-14 -5.068967440480308E-14 -2.287333881601601E-12 2.813773865388235E-9 -2.803743522678565E-9 -8.097020029236704E-11 peri -2.105130056929654E-13 5.337796737180139E-13 6.919610278536872E-10 -2.803743522678565E-9 2.991626509588037E-9 8.116713804670032E-11 i -1.846910067547325E-15 4.188510803716977E-15 1.752766251255035E-12 -8.097020029236704E-11 8.116713804670032E-11 1.84408324418166E-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 15.94   n/a E2021B10   90976 (1997 WH38)          Discovered 1997-Nov-29 by LINEAR at Socorro Reference: 20041028/Numbers.arc Last Updated: 2004-10-29 [ show close-approach data ] Alternate Designations  1997 WH38 = 2000 QA227  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-14 04:41 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin