+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   100846 (1998 HW25) Classification: Main-belt Asteroid          SPK-ID: 2100846 [ 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 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1359586836386899 3.8086e-08   a 2.226395586554165 7.0099e-09 au q 1.923697773347272 8.6631e-08 au i 6.414623034824364 4.2068e-06 deg node 40.96895304765024 2.6867e-05 deg peri 323.3129369300612 2.9765e-05 deg M 130.8289024724642 1.1507e-05 deg tp 2458759.536012782327 (2019-Oct-03.03601278) 3.9263e-05 TDB period 1213.394230160833 3.32 5.7306e-06 1.569e-08 d yr n .2966884060032844 1.4012e-09 deg/d Q 2.529093399761059 7.963e-09 au   Orbit Determination Parameters    # obs. used (total)      1147      data-arc span      8332 days (22.81 yr)      first obs. used      1998-03-29      last obs. used      2021-01-19      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4855      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 08:26:21   Additional Information  Earth MOID = .925157 au   Jupiter MOID = 2.93416 au   T_jup = 3.625  [ 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 15.6   n/a MPO439690   100846 (1998 HW25)          Discovered 1998-Apr-20 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-Feb-28 17:03 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin