+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 9 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07061701737669851 6.7734e-08   a 2.308659874001634 1.2868e-08 au q 2.145629199562374 1.545e-07 au i 1.704598587377816 8.5231e-06 deg node 29.07141413817371 0.00023842 deg peri 205.083714055353 0.00024733 deg M 181.3899555990997 6.7118e-05 deg tp 2459636.184667576824 (2022-Feb-25.68466758) 0.00023927 TDB period 1281.263218399956 3.51 1.0712e-05 2.933e-08 d yr n .2809727110168422 2.3492e-09 deg/d Q 2.471690548440894 1.3777e-08 au   Orbit Determination Parameters    # obs. used (total)      159      data-arc span      8218 days (22.50 yr)      first obs. used      1997-04-03      last obs. used      2019-10-03      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .6619      source      ORB      producer      Otto Matic      solution date      2019-Nov-07 11:54:33   Additional Information  Earth MOID = 1.13434 au   Jupiter MOID = 2.51032 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 ] 2020-Oct-25 13:58 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin