+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   31321 (1998 HD3) Classification: Main-belt Asteroid          SPK-ID: 2031321 [ 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 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08400030830770809 4.4985e-08   a 3.19829507044988 1.9728e-08 au q 2.929637298473067 1.4766e-07 au i 5.890811266112606 4.1702e-06 deg node 38.25841243925066 4.2756e-05 deg peri 132.4837752179385 4.9459e-05 deg M 353.1839549601656 2.3373e-05 deg tp 2459040.055435526135 (2020-Jul-09.55543553) 0.00013564 TDB period 2089.181733129281 5.72 1.933e-05 5.292e-08 d yr n .1723162682744569 1.5943e-09 deg/d Q 3.466952842426693 2.1385e-08 au   Orbit Determination Parameters    # obs. used (total)      1253      data-arc span      21758 days (59.57 yr)      first obs. used      1960-10-17      last obs. used      2020-05-13      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54094      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 01:01:42   Additional Information  Earth MOID = 1.93894 au   Jupiter MOID = 1.50585 au   T_jup = 3.181  [ show covariance matrix ] [ 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 14.0   n/a MPO296380   31321 (1998 HD3)          Discovered 1998-Apr-21 by Klet at Klet Reference: 20011130/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1998 HD3 = 1981 JY4 = 2000 SN32  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-17 23:22 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin