+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1640914376692062 4.4576e-08   a 2.289313021430516 1.0052e-08 au q 1.913656356469148 1.0328e-07 au i 4.898927502606077 4.3192e-06 deg node 246.8888021220273 5.3267e-05 deg peri 150.5738542058263 5.4915e-05 deg M 198.1912290556148 1.6341e-05 deg tp 2459569.164022825275 (2021-Dec-20.66402283) 5.9908e-05 TDB period 1265.191293539103 3.46 8.3333e-06 2.282e-08 d yr n .2845419517494282 1.8742e-09 deg/d Q 2.664969686391883 1.1702e-08 au   Orbit Determination Parameters    # obs. used (total)      676      data-arc span      8267 days (22.63 yr)      first obs. used      1997-11-26      last obs. used      2020-07-15      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54213      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 20:41:41   Additional Information  Earth MOID = .923062 au   Jupiter MOID = 2.74565 au   T_jup = 3.577  [ hide covariance matrix ] Orbital Elements at Epoch 2457423.5 (2016-Feb-05.0) TDB Reference: JPL 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1631171392558421 4.4454e-08   q 1.917049163670127 1.0286e-07 au tp 2457038.477048878264 (2015-Jan-15.97704888) 5.07e-05 TDB node 246.9565861004278 5.3333e-05 deg peri 150.6290199038167 5.5006e-05 deg i 4.894333123733931 4.3152e-06 deg   Orbit Determination Parameters    # obs. used (total)      676      data-arc span      8267 days (22.63 yr)      first obs. used      1997-11-26      last obs. used      2020-07-15      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54213      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 20:41:41   Additional Information  Jupiter MOID = 2.74565 au   T_jup = 3.577  Orbit Covariance (6×6)   e q tp node peri i e 1.976167896201449E-15 -4.55721696850224E-15 -7.809822236812575E-13 2.327129669264839E-14 -2.22954543670742E-13 -1.91550427839493E-15 q -4.55721696850224E-15 1.057950590295687E-14 1.984796092066172E-12 -5.238453564261691E-14 5.639776093439039E-13 4.35676869960875E-15 tp -7.809822236812575E-13 1.984796092066172E-12 2.570515811841494E-9 -3.649826223512254E-12 7.055620336050912E-10 1.875197575698861E-12 node 2.327129669264839E-14 -5.238453564261691E-14 -3.649826223512254E-12 2.844405689653664E-9 -2.834620109548081E-9 -8.331349687043033E-11 peri -2.22954543670742E-13 5.639776093439039E-13 7.055620336050912E-10 -2.834620109548081E-9 3.025674960505956E-9 8.353359289250111E-11 i -1.91550427839493E-15 4.35676869960875E-15 1.875197575698861E-12 -8.331349687043033E-11 8.353359289250111E-11 1.862053182271553E-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 16.0   n/a MPO309817   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-Jan-22 06:13 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin