+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   100575 (1997 HD3) Classification: Main-belt Asteroid          SPK-ID: 2100575 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 11 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07043279532674578 5.5796e-08   a 2.309040784367961 1.1645e-08 au q 2.146408587401464 1.2997e-07 au i 1.704492704708653 6.2137e-06 deg node 29.06655940518137 0.00022492 deg peri 205.0746449124356 0.00023281 deg M 237.5833751696228 6.2635e-05 deg tp 2459636.296495250589 (2022-Feb-25.79649525) 0.00022389 TDB period 1281.580328714318 3.51 9.6951e-06 2.654e-08 d yr n .2809031879891229 2.125e-09 deg/d Q 2.471672981334458 1.2465e-08 au   Orbit Determination Parameters    # obs. used (total)      194      data-arc span      8690 days (23.79 yr)      first obs. used      1997-04-03      last obs. used      2021-01-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .61715      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 08:25:41   Additional Information  Earth MOID = 1.13375 au   Jupiter MOID = 2.50914 au   T_jup = 3.582  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 17.5   n/a MPO436468   100575 (1997 HD3)          Discovered 1997-Apr-30 by Spacewatch at Kitt Peak Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-01 17:28 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin