+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   100613 (1997 SM31) Classification: Main-belt Asteroid          SPK-ID: 2100613 [ 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 13 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .228661647067164 8.7409e-08   a 2.530387914419131 1.3096e-08 au q 1.951785246189206 2.2398e-07 au i 8.335652860578204 1.9038e-05 deg node 356.5512146877318 3.9672e-05 deg peri 92.22534720525482 8.8617e-05 deg M 161.4622582123816 7.373e-05 deg tp 2458341.102030757277 (2018-Aug-10.60203076) 0.00030241 TDB period 1470.209023183207 4.03 1.1414e-05 3.125e-08 d yr n .2448631414467515 1.901e-09 deg/d Q 3.108990582649056 1.6091e-08 au   Orbit Determination Parameters    # obs. used (total)      377      data-arc span      7883 days (21.58 yr)      first obs. used      1997-09-28      last obs. used      2019-04-29      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .64564      source      ORB      producer      Otto Matic      solution date      2019-Jul-13 05:17:18   Additional Information  Earth MOID = .988975 au   Jupiter MOID = 2.17264 au   T_jup = 3.400  [ 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 16.7   n/a MPO395888   100613 (1997 SM31)          Discovered 1997-Sep-28 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-24 04:37 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin