+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 13 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2277191619709244 8.6849e-08   a 2.532245746142567 1.2783e-08 au q 1.955604866926544 2.2179e-07 au i 8.337057400547241 1.9044e-05 deg node 356.4809160009443 3.9623e-05 deg peri 92.33527358641169 8.9107e-05 deg M 210.3335124365509 7.4223e-05 deg tp 2459812.398330176606 (2022-Aug-20.89833018) 0.00030281 TDB period 1471.828479773683 4.03 1.1145e-05 3.051e-08 d yr n .2445937179143019 1.8521e-09 deg/d Q 3.108886625358591 1.5694e-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 = .992482 au   Jupiter MOID = 2.17218 au   T_jup = 3.399  [ 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 ] 2021-Mar-03 03:39 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin